I've read several complains about the Hero Skill Tree. I think we could classify the existing problems as follows:

1. The Common Skill Tree is too weak. Only Inspirational Leader and Cold Operator are particularly handy, and both are usually accessible by the other Skill Trees.
2. The only real choice is between whether you make Governor Heroes and General Heroes, with no inbetween.
3. Cultists and Wild Walkers are overwhelmingly better Governors than everyone else in most cases, so it is really about buying the Heroes in these two factions whenever they are on the Market.
4. Most Heroes can become good Generals, since pretty much every skill in the General Tree is always handy, but Wild Walkers and Forgotten can pretty much teleport around the map due to their Managed Torpor/Functional Insomniac Skill, so they are the most handy..
5. Pretty much all General Skills are good for General Heroes and all Governor skills are good for Governors, so the only choice in the Skill Tree is whether you max out a specific Skill level or go to the next, and that is usually not that complex a choice..

My suggestions would be:

1. Managed Torpor/Functional Insomniac probably shouldn't have a "level 2". Instead, some skills in the Common skill Tree could be boosted by an Assignment Cooldown bonus. In particular, I am looking at "Indiana Bones" level 2 and "Fast Healer" level 2. I think the Flavor would be justified somewhat, while also keeping Forgotten as the fastest Generals (due to Fast Healer being in the path of Managed Torpor to Lord of the Trance).
2. Thrifty probably should come earlier in the Skill Tree, since most problems with maintaining an army usually are in the early-mid game. I would suggest putting it as second in the left side of the tree, while moving No Idle Hands and Siege Mentality up.
3. I would consider powering up the Common Skill Tree in other ways as well. For example, making Defender only 2 stages that raise Defense by 100 each would make it much more attractive, but such things would probably require a playtest team.
4. Cut off Cold Operator from being connected to the side trees of most Factions. Except maybe Cold Operator and Vaulter/Mezari, as that just makes sense. It is a really great skill, so I think it'd be fair to make you go through a bit of the Common Tree to get it..
5. Cut off Cultists and Wild Walkers from connecting with Inspirational Leader from their faction Tree. Or maybe not. Maybe this is too much. But I suggest considering it. Even if it is kinda flavourful for Cultist
6. Make more of the "General Hero" / Class Tree give a bigger bonus to Units of a Specific Class. Kinda like the Ranged Class can boost the range of all ranged units. So the Infantry Hero could have a Skill to boost the Defense of Infantry Units only (but more than the other Skill), Cavalry could boost the Initiative of Cavalry Units, etc. This for all except Support (as having an Army of Support Units seems so horrible) which could instead have the option of a Skill that grants Disease Immunity to the Army (or maybe something that gives a specific terrain bonus, but you get the idea, something situational but powerful).

These are all my suggestions. That said, I am still a relatively new player. Just went over 220 hours of play and have no experience in Multiplayer, so take all that with a grain of salt.

Hello.

Yes, indeed.

I writted a document of suggestions: https://docs.google.com/document/u/1/d/1abpal6YLpnDWA1qma8NRx4o9_B4aE9G2x8T8p50HLhg/edit#

Few others multiplayers have given their feedback on it.

I think you should join the ELCP Discord, it'sa good place to have feedback from very experimented players : https://discord.gg/3zcqXSB

Many of those ideas seem great, jojo_fr, the document was a great read, but I would refrain from making too many Skill levels too different from one another. For example, "No Idle Hands" being related to "Fast Learner 1" makes sense. It being related to Rapid Mutation just feels a bit random. Some Capacities getting unlocked after maxing out a Skill is nice, but having each level grant a different Capacity could probably make things a bit confusing for new players due to all the new terms that they'd be hit by when just inspecting the Skills. 

I also don't think that maintaining the Tree Links as they are should be an important constraint. For example, the issue with the Drakken as Governors, IMO, is that the Approval bonus often comes too late at level 4 and requires you to get at least 1 General skill beforehand. Moving a couple Skills around and letting them get Inspiring Leader more easily could make them decent governors.

And I do feel like my idea of moving some Cooldowns towards the Common Tree and away from WW/Forgotten could mitigate the clear intentions the Devs seemed to have with making some Heroes both Generals/Explorers and Governors. Drakken and Morgawr in particular, that seem like they have trees that intend them to constantly switch roles could probably also use at least a "-1/-2 Cooldown" somewhere as a level 2/3 in one of their skills. Maybe in "Lord of the Sea" (as a level 2) and "Battlesaur" (-1 on level 2 and level 3).

Hey Jojo! Do you have someone working on this? If not, when I finish up one of my projects, would you mind if I try to implement these?

Hello.

I answered you by Discord. The answer is no, no one is working on it.
I hope you will.  :)