I agree about removing them from the heat and draining when they're still a bit chewy, b/c the warm sauce will soften them a bit more.

That's what I do too with a tablespoon of oil so that it wont stick together, but if think you overcooked it or underdone, drain it immediately then pour some cold water while it's still in the colander (I mean drain it also with cold water). It will keep the noodles firm.

I THOUGHT I had read on a box one time that you should drain and then use cold water and drain again. But seems to me that after this process, all you'd have is cold noodles. Yucky.

Since my noodles go straight to the pasta bowl after draining I don't rinse.

The purpose of draining it with cold water is so that it does not continue cooking , in fact, if you touch the pasta, it's not really cold, it's still warm. You're just going to suspend the cooking process, and since you're gonna put the warm sauce anyway, it's not really cold.