Yep, I'd be down with it, if maybe we could have "skill loadouts" or something. Changing individual skills out sucks manually, and sucks making a macro for it. It's all an illusion of choice, and it'd be great if there was real choice. But honestly, I wouldn't mind tossing role actions to the side completely (although I would like to keep Rescue).
True, Largesse was made for WHM/AST. The only thing I can see Largesse being useful for, for SCH, is to try and get a massive critlo. But, it's not spammable enough. Largesse is a lot better for regen based jobs, WHM and Dirunal AST.