Shadow Mage suggestion

[JustAFingerWiggler]

Right, so there's three spells that can summon shadows.

Greater Shadow Conjuration
Shades
Shadow Conjuration

What I'd like to suggest is that, given all of these spells summon critters that only last rounds/caster level, that casters with the shadow mage path have the duration extended to hours/level, turns/level, or 24 hours per normal Summon Monster spells. It should be a fairly easy change to script, I'd think, and would give a currently-underwhelming class a bit more usefulness.