Don't know if this would at all be possible, and don't know if it's been suggested before, it probably has, but i couldn't find a post on it.
But i was wondering if it would be possible to make Animate dead, Create undead and Create Greater undead with a sub-menu, like polymorph, shapechange and so on, simply so that being the specified level merely unlocks the next type of undead, instead of forcing you to summon that one every time.
This has two merits, as i see it:
1) the obvious mechanical ones. example: you usually don't summon mummies to kill fire-things.
2) the RP wise: for the necromancer it might sometimes make sense to be able to summon a ghoul rather than a spectre, and vice versa. I honestly find the spells that summon undead to be a tad boring and dry for this exact reason.
And i suspect this could add a lot of flavour to my necromancer RP if possible
