I guess the menu for splice tuning is just for determining the right parameters, being just next to the Palette.
(hint: when tuning splice settings, only input 1 and 2 are used, never the others).
Once you have found the right parameters, report the values in Canvas : this will furthermore allow you to tune multimaterials transitions (PLA->PLA different from PLA->PVA and A->B different from B->A). This would be soooooo painful to do with the small touch screen.
