Sooooo, to get back to the beginning of the topic, this is what I picked so far:
HP 50/50
VIT 50/50
INT 50/50
MND 50/50
Magic 50/50
And I still have like, what, 30 free points to assign or something?
Might go MP next but for now I'm holding.
My reasoning for those choices was to give of course more survivability to the trusts.
More HP, more VIT to slightly raise defense against physical damage, INT and MND against magical damage.
Magic is to boost the potency of some spells, give them more macc, I dunno, sounds slightly useful.
I'd be all to boost their physical damage/accuracy but until (if ever) they give us an option to "turn off" Trust WS, constantly breaking my multistep SCs, I'd rather have them miss as much as possible.
Less hits landing => less WS breaking my SCs :-P
If someone asked me what I would've wanted from trusts I would've answered "longer duration buffs, more durability, possibility to turn off some things like WS or Haste1".