On the notion of limping more:
On tables where any PFR is going to get most of the limpers to call, the PFR loses equity in my experience. It does not achieve the primary goal of eliminating opponents. The secondary goal of getting my chips in when I have the best hand is almost moot. When I'm facing a 4 or 5 handed flop, it only serves to prematurely bloat the pot. On these tables, villains don't know what an overbet means, and they will call down when their busted flush draw turns into 3rd pair on the river. So getting the chips in early doesn't matter, 'cause they'll put them in anyway.
I still PFR my premium hands, but I'm willing to limp SC's, OSC's, S1G's, and S2G's (farming for straights), all Kxs and Axs (farming for flushes), and of course small PP (set farming). I (almost) never play A9o-, since they'll move or call all-in with any Ax hand that makes pr A's, and I want to out-kick them when I choose to call them down.
When I first started opening up like this, I made the mistake of changing my goals when I hit the flop w/ weak pair. I had to develop the discipline to say to myself, "I limped to catch a flush w/ A4s, and now my pr A's is not enough to continue w/ a 4 kicker," then check, and fold to anything but a min-bet.