Time Prison on yourself should bypass your saves.

[Aquillion]

There's lots of reasons why a caster may want to Time Prison themselves (especially if they use long-term field damage spells.) But often, when I try and hit myself with it, I resist. Saves are already, I think, a bit underpowered in ToME; punishing the player for having high saves by making (potentially) useful spells that they may want to cast on themselves fail only makes it worse.

So perhaps Time Prison should bypass your saves if you cast it on yourself?

[marvalis]

maybe just have all spells bypass to-hit checks

pseudo-code:
if target=caster then hit=true end
else checkhit

[Aquillion]

maybe just have all spells bypass to-hit checks

pseudo-code:
if target=caster then hit=true end
else checkhit

Only single-target spells, at least. There's plenty of reason why I might want to be able to resist an AOE spell that I left myself in the area for.

[bricks]

The same could be done for friendlies. Nothin' like Time-Prisoning an Injured Seer.