Better url structure

Is possible adding this url structure without loss traffic ? (301 redirect)
for product :
from this http://www.mysite.com/p/40/bcaa-amino-forte
to this ? http://www.mysite.com/bcaa-amino-forte

And category
from http://www.mysite.sk/c/5/proteins
to http://www.mysite.sk/proteins

Vote here:

http://nopcommerce.codeplex.com/workitem/10164