Cheiromancer said:
This paradox thing is making my head hurt. Which I suppose is what is supposed to happen.
Paradox is inherently complex and nonsensical.

Part of the reason why it's so much fun to mess around with it.
Undead are only hurt by healing spells because they explicitly say that they use positive energy. Since the correction is based on the wounds being fixed because they just never happened, an undead creature would still be healed of damage same as a construct. Although in my opinion it wouldn't really be out of line for it to effectively deal double damage against undead.
You might apply similar logic when using some nonlethal version to cheat some healing. You'll just end up fixing excess nonlethal damage. But again, having the excess convert into straight healing wouldn't be out of line. By the way, you can find Subdual Substitution in the Divine section of the SRD. It only works on spells with the five energy subtypes. It's also found in Complete Arcane as Nonlethal Substitution where it's taken a slight nerf to exclude sonics and require a one level slot tax.
Quip said:
Are there any complications if you kill youself with it, in order to advoid a more permanent demise?
Ooh. Didn't think about using it to save your own skin.
Time hop jumps a target out of the timestream for 1 round/level and it's only a third level Psion/Wilder power. Zapping yourself might not work if you don't kill yourself, but it's only sixth level compared to the autosuccess of the eighth level
maze. This all assuming it would bring you back regardless of stuff that might happen to your body in the meantime.
Kelleris said:
I might be willing to use some other status condition if there was one that worked on undead, constructs, etc.,
Having the backlash stun the caster feels best the way I picture the spell working. As discussed earlier making the backlash ignore immunities can work but there's already a fair bit of legalese in there. If you want a status effect that will work on undead that's similar to being stunned, there's always the weaker dazed condition.
Now I want to say this about your new Bill & Ted spell, Kelleris's time-lost crawler: STOP IT! Quit making such damn cool spells!

It is most EXCELLENT.