Playing from set board

I went to make a set peice game the other day and was displeased to find that there are restrcitions to the number of peices of different types you can have on the board.

I wanted to play a knights game (all knights except the king) but it would not let me have more than two knigths per team.......is there any chance this restriction can be changed seeing as how the set peice games are unrated anyways?

I tried again, and I found that I can make 10 knights (the two original and then make all the pawns knights). But I would still like to make everything a knight, its a very fun way to play and learn about knight movement.