I see 2 different ways of doing this. The simple way is when you complete all research in a tree you get a bonus of some sort, either a special item of some sort or more likely a flat bonus of some sort. Like getting all of chemistry means 20% more explosive radius to all weapons, or all of mechanical 10% bonus to hull or armor health. The other way gives a portion of the bonus for every node unlocked, keeping in line with the chemistry idea above that would end up something like 1.53% for every node. If you combined the ideas you could do something like 1% for each node and a flat 7% for getting everything, which would probably be the best bet. The whole reason I feel this can be a good idea is it helps 2 fronts, focusing on research and boons during endgame. Generally it's not a great idea to get stuff solely from 1 tree, most trees have some weakness that leave your tanks unable to effectively deal with something(buildings, infantry or other tanks). It might be a good idea for a commander to focus though if they know their team is only coming across certain elements or they can rely on players to handle stuff, and that bonus for getting everything might be the edge they need for their plans. It can help end games too because during the endgame when you as commander have basically gotten all the weapons your team should be using you, and more likely the team, feel the need for more research. If there was end caps to research trees it would help your team get that extra power to turn the tides towards your favor. I am tempted to write a list of what' could be done with each tree but I feel, and know, the thread will get sidetracked by that instead of the central idea of just a bonus to completing a research tree. I will just say that I feel like bonuses to just about any vehicle aspect would work, along with cost reductions. There isn't too much to be done with buildings, and infantry stuff still feels like it needs it's own research tree, I'm not sure wrapping it into basically the vehicle research is a good idea. So, what do you guys think?