[Eeegah]

Table size is the most important factor here. If it's a full ring game, there's a number of hands we can open-limp--77 and 88 come to minds, and 22-66 if the table is passive enough. Low suited T or better such as JTs, QTs and KTs are also fine in my book (KJs is a raise for me).

As the table shrinks it's roughly equivalent to the first few seats folding in a full ring game. You probably are aware that you shouldn't open limp if it's folded to you in MP2 or so, which is equivalent to a 6-max game.

Edit: I'll be honest, I tend to fidget if it's folded to me in MP2 or whatever and I'm holding, say, A4s. I tend to muck then, but I feel odd as it's equivalent to having a lower vpip than in a full ring game. Or something, I need to work on it more :/