Time charge vs. rake in Vegas poker rooms

[Warteen]

I'm heading to Vegas in August and want to play some poker there (probably 1/2 NL). Lately I've turned a decent profit at the local "charity" game in Lansing by buying in with a short stack and playing super-tight until someone doubles me up (or busts me out, in which case I repeat step one). A large part of the reason I can do this is because, unlike the only casino cardroom I've been to, the rake is taken from pots, not directly from player stacks.

My question is this: In Vegas, how many of the poker rooms do a time charge instead of a pot rake? Is there any hope for tight, shortstack play?