| You say "we've defeated the foe, I'd like to tie him up now".
He stays tied up until he's freed, or frees himself with an acrobatics check.
While he's tied up, the players can probably cherry pick whatever conditions they'd like to apply: immobilized, restrained, blinded, deafened, slowed, dazed, stunned (with the special proviso that stunned doesn't prevent escape attempts) etc.
After all: any of those is significantly less effective than "dead" which was the other choice they had when they took him out.
My goal is to not punish characters who choose to capture instead of kill. | 
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