The flap menu is great but it doesn't appear until you tell the radio that you have flaps in the system menu.
The biggest advantages are that elevator compensation, flap throw, and transition speed are all in one place.
The other, not immediately apparent issue, is that if you use a P-Mix to setup your elevator compensation, and you have your flaps slowed down in the servo menu, then the mix comes on instantly and the flaps take a few seconds to catch up, this isn't desirable. With the flap speed set in the flap menu, the elevator compensation comes in at the same rate as flap travel.