I think having a "Path of the Summoner" at level 4 would be nice as well. Maybe reduces summoning spells by 50% in tactical. Guarantees the Summon I,II, III skills show up on subsequent level ups. Possibly new sets of skills like Enhanced Summons Attack I,II,III and Enhanced Summons Defense I,II,III
I mean even a warlock or melee-er can summon basic versions. If the summons got more of a boost under a summoner. Whoa. watch out.
I like that being a summoner gives you + levels to summons as does the summon skills. But it's pretty underwhelming unless gaining levels means more than a couple extra hps. They could get some ability that scales with those levels in addition to being helped out by a little bonus to attack and defense.
Also, why no magic items that give bonuses to summoning?