Hello. I would like to slow down the pace at which one can discover new technologies. Ideally by changing a single tag somewhere in the gamespeed values, but I couldn't find anything there. I also can't find a number for 'technology cost' or somesuch, though, so I suspect it is wholly variable. How would I change the cost of a technology, at any rate? Thank you in advance. :)

EDIT: Heh, I found it myself, actually; in SimulationDescriptors[Research].xml , one can change the BaseValue tags (I changed them from 1 to 3, tripling the tech cost). :)

<Property Name="TechnologyCostQuadrantScienceAndExplorationMultiplier"BaseValue="3" MinValue="0"/>
<Property Name="TechnologyCostQuadrantEconomyAndTradeMultiplier"BaseValue="3" MinValue="0"/>
<Property Name="TechnologyCostQuadrantEmpireDevelopmentMultiplier"BaseValue="3" MinValue="0"/>
<Property Name="TechnologyCostQuadrantMilitaryMultiplier"BaseValue="3" MinValue="0"/>

Selein wrote:

This may be somewhat off topic but is there a way to change it so each tech tier has a set cost for techs of that tier that only changes with the game speed and not how many techs you've discovered¿

Yes there is, in %Install Folder%\Endless Space 2\Public\Simulation\SimulationDescriptors[Research].xml it defines the variable that set technology costs 

It is lines 130 & 132 that make technology costs rise as you research

Line 130:         <BinaryModifier TargetProperty="TechnologyCurrentCost"   Operation="Addition" Left="$(UnlockedTechnologyCount)" BinaryOperation="Multiplication" Right="3"      Priority="1"/>
Line 131:         <Modifier       TargetProperty="TechnologyCurrentCost"   Operation="Power"Value="1.05"                                                                          Priority="1"/>
Line 132:         <Modifier       TargetProperty="TechnologyCurrentCost"   Operation="Subtraction"    Value="$(UnlockedTechnologyCount)"                                          Priority="2"/>

Remove the lines 130 and 132 to disable growing technology costs.

Lines 15 to 19 control Era Tech costs you can increase them if you want (to balance out the reduction in tech costs)