Master Planner 1/1 (for 100% hit chance on elite units)
Garrison Annex 3/3 (for more chances to use Mounted Marksman)
Fast Learner 3/3 (30% extra XP = Level quicker)
First Aid 3/3 (less time producing mounted swordsman)
I intend to max out all low tier jog (2/3)/jugs/rapid fire to make for cheaper and quicker 'research' towards 21/21 spec'd generals where possible.