1) yeah, I usually don't have any stomach problems if I go #2 first thing in the morning and once before my run. My lunch was a pb&j, chocolate milk, and a banana do nothing too fatty or heavy, but it was filling. I guess I've adjusted to feeling full on a run, but I don't eat close to harder workouts
2)My mistake for saying moderately fast - obviously running that pace for a marathon won't seem fast to me. But, since I'm tired from my training and probably already ran twice, up to 20 miles, I don't think I would mentally have the motivation to actually try to run it fast, so I wouldn't try too hard.
Also, I do a lot of my easy runs, especially recently, much slower than 7:00/mile, usually around 7:30-8. I wasn't the type to do easy runs too slowly, but now with a lot of volume I just focus on nailing the tough workouts each week and take it easy and carefree in easy runs.