I agree; having home and away lineups would be nice. I've had a lot of teams where the home/away platoon was more important than the left/right platoon.
While we're at it, I'd also like more choices for relief beyond A and B. Even adding a C - which would roughly translate as "OK, if you absolutely HAVE to use someone else" - would help immensely when managing fatigued (or close to fatigued) bullpens.