Actually, the issue of raising pf is one I've been thinking about a lot.
I've recently started raising with hands I would normally have limped if everyone ahead of me has folded.

So while I'll limp KJ, KQ, KJ, QJ I'll raise them if there are no limpers so far. And if the tables' not passive enough I'll junk them in early position.

I'm still raising with AJ, which I still don't know if it's a good idea or not. And I'm calling pfrs with AJs, AQs.

The only hands I open limp are small pockets pairs and the ocassional suited connector in midde-late postion.

I've also started occassioanly raising crap from the button. Just as an experiement when there's only a couple of early limpers.