I can't see a real reason for more than eight enemies in a troop at a time ...
The only time I can see fighting more than eight enemies in a single battle would be like ... as some die ... new enemies come.
Edit:
I suppose if my idea were to be incorporated, this would be needed wouldn't it??
The way the database works is that you have to hide the enemies that would appear later, and reveal them as they died, eh??
In that sense, I guess this would be interesting ...
Not something I would use myself, but it could make for some kick ass boss battles actually!!
I wish you the best of luck with this Game_Guy. =D.