Bigger Blinds?

[Kaeser]

Alternatively you could also have a 3rd big blind posting a blind raise (same as a live straddle only required). I can't see this causing players to "play better hands" though. With more forced money in the pot it would encourage and in fact require a looser style to win.

[SoftcoreRevolt]

Wow, the reasoning of the OP is just.. astoundingly bad poker logic.