I don't do minors or FAAB, but for #3, you have to use just SP and RP, but you can set it so that there are some spots overlapping so that there are technically P slots. For example, my league uses 7 pitchers. I want a minimum of 2 SP and 2 RP, and the other 3 slots to be either. I set the Max on SP and RP to 5. That way, if you activate 5 SPs, the other 2 have to be RPs, and vice versa. (This is coming out way more complicated than it really is.)
For #6, the illegal roster scores zero points (accumulates 0 stats) for the period it was illegal.
Be excellent to each other.