Yes, that's what i think, i've order somes goodies from a main hobbies today and i've order the Racer Edge diff locking putty.
I'll put it on the center diff, and try to run only with the front brake.
Anyway, i'll not race with my Mugen, it's only for bashing and play on the campground this summer with my son.
If i've just a little brake, that's enough for me.
I'am a truck driver and i'am able to never touch the brake on a 200km forest road trip with a 140000lbs truck, so i'am sure that i'll able to drive a 9lbs r/c truck with only little brake on front