Base Attack Checks and Favored BAB

Q: For classes who have a favored attack bonus and a base attack bonus, which ones do they use when making base attack checks? The text seems to imply they use their base attack check but it would seem to make more sense for the weapon master to use his favored weapon (as long as he is armed with it) in such cases.

If a character is armed with their favored weapon, I allow them to use the favored attack bonus, if they have one.

Base Attack Checks and Blindness

By the rules as written, being blind does not affect Base Attack Checks. If I were to house rule differently (and I'd certainly consider it), I'd apply a -4 penalty (the same as for most Strength and Dexterity based skill checks). I wouldn't use a miss chance.

Base Attack Checks and Disarms or Sunders

Using Base Attack Checks instead of opposed attack rolls for Disarm attacks sounds like a worthwhile house rule to me. I'd consider doing the same for Sunder attacks.