It would be fine to play 4 downs with a smaller Peewee(NFL) ball and when
Up until Peewee(11-12) play with 4 downs, at the Peewee level move to 3 downs but keep the small ball
at the next level(minor Bantam) introduce a CFL ball
So at age 13 have Kids playing full CFL rules, which by that age the QB's should have the arms to do some longer passes, I seem to remember that is around the time passing became more an option.
Although a full CFL sized ball may to be too large, the ball they have in the Bomber store, the Junior sized ball would be best(I want to buy that ball it looks so easy to toss for a bomb)
If that happens then introduce the CFL ball sometime between 15 and 18.
ALSO FOR ALL LEVELS OF MINOR FOOTBALL AFTER AGE 10 INCREASE THE AMOUNT OF GAMES PER SEASON!!!!!
CIS should be 12 game reg season + Playoffs - Season needs to start mid/early august, works best for the guys schooling although attendance could be hurt
Junior should be atleast 10 game season + playoffs(For some reason no PCF team plays in Week one and all teams get a bye..huh? the Season is long enough already)
All leagues below Junior should also be 10 total Games(maybe only 8 reg season + 2 pre-season) + playoffs