the biggest problem i would see with using t-molding on 1/4" wood is once you cut the slot, there would be hardly anything left. most T-molding i've seen uses a 1/8" slot cutter, that would leave only 1/16" of wood on either side of the slot, which i can't imagine would be strong enough to hold up to anything. I'd either look for a some type of glue on molding, or just use a round over bit on it.