Lopke_Quasath said:
I am looking for some further conjurer feats beyond "Augment Summoning". [...]
Hi!
Let's take a look:
Beckon the Frozen, Prereq: Augment Summoning, Spell Focus (Conjuration); Benefit: Summoned creatures gain cold subtype and +1d6 cold damage to attacks; Source: FB 47
Celestial Summoning Specialist; Prereq: Knowledge (the planes) 2 ranks, Knowledge (religion) 2 ranks, Nonevil alignment, Summon monster ability; Benefit: Summon additional good-aligned creatures; Source: PLH 38
Fiendish Summoning Specialist, Prereq: Knowledge (the planes) 2 ranks, Knowledge (religion) 2 ranks, Nongood alignment, Summon monster ability; Benefit: Summon additional evil-aligned creatures; Source: PLH 39
Stalwart Planar Ally, Prereq: Cha 13, Spellcraft 5 ranks, Planar Touchstone, Knowledge (the planes) 8 ranks, Object from touchstone site; Benefit: Improve resilience and duration of summoned creature; Source: PLH 42
Icy Calling; Prereq: Con 13, Snowcasting; Benefit: Summoned frostfell creatures are stronger in cold weather; Source: FB 48
Celestial Mount; Prereq: Paladin level 4th, Benefit: Mount gains celestial creature template; Source: BoED 41
FB= Frostburn
PLH = Planar Handbook
BoED = Book of Exalted Deeds
Isn't very much, but I hope this helps

Kind regards