At least in my experience, there seems to be some problems with the "type amount" feature?  For instance, often while I am typing, the value will reset to 1 mid-type, or keep changing to other values while I am typing.  

However, even assuming that becomes fixed later, it might be nice to be able to use either alt-click or ctrl-click when you intially click on the item in the list window, to automatically set that value to maximum and bring it to the lower trade window.  E.G. if I have 10,000 Dust in my Empire, and I alt-click on Dust in the initial list window, it automatically places 10,000 Dust into the bottom trade window.

This would be useful as many times, you don't know whether an AI Faction desires a certain item until you offer a certain amount of it.  This feature would allow you to tell in just 1 click whether or not the faction is at all interested in any amount of Dark Glitter, for example.