I'll go ahead and help you out before you get some smart ass responses.
1.) You can bat at least 11. I can't remember if you can bat a 12th or not. I know I have in some tourneys, but 11 for sure. Honestly you don't wanna bat any more than that (I would recommend 10) because the more you bat the longer it takes to turn the lineup over and chances are your bottom of the lineup is weak in E
2.) some tournaments a HR in E is an offensive ejection and inning ender (NITs). In this one I believe it is just an out, and does not end the inning.
3.) Reason is because of how many teams there are in the other brackets. E is the lowest so they get the least priority as far as scheduling games at BLD, so to get it in yall gotta go to HSP. In the big tourneys this will happen ALOT if its a BLD tourney. Expect to go to places like HSP or Pearland. It sucks but deal with it, or play up.