I let the engine come to an idle while refueling.... I use the bump up feature on my M8 while refueling. The bottom end should allow it to idle just fine. You will have to feather the throttle back up to WOT after refueling.

If the engine flames out, just lean it a half turn and restart it. Open the needle back up after it gets running.

Some people change the con-rod, but personally I just inspect it on a periodic basis and keep running it for up to 1.5- 2 gallons.

Don't worry too much about the temp while running it WOT. WOT is just to flush crap out of the engine. I do try to keep my engine at least 140F when running WOT. Just get it so the wheels barely turn on a full tank- as the tank empties it will lean out and the wheels will spin a little faster. If you have a rear diff, just grab a wheel to bring the temps up.