I don't want to change the public pool that much, but as it is, personally i end up using the same few traits in unit construction and i find it quite dull.
+ 20 capacity
+10 capacity +1 attack
+2 initiave
on ocaasion i put in charge.
other than that, it's all kinda meh
sure you can build a tank with +1 hp pr level plus the armour boosting traits, but... meh
i just don't find very many possiblities to be worthwhile atm. I think each trait should have value and mean something I want a reason to use that trait i never look twice at.