is it possible? sure
is it a good idea? probably not (depends who you ask)
although proper (or even excessive) biological filtration is important, its not nearly as important as your maintenance schedule.
the more you plan to keep, the more often you should plan to clean/WC your tank.
youre looking at 25-30% WC weekly on a "traditionally shocked" tank (1"[square] per gallon). so if you plan on "overstocking" your tank, you will want to increase either the amount or frequency (or both) of your cleaning/WC schedule.