I've been playing with DQ Guru. As a non-technical individual, it would be nice to be able to create 'super transformations' that are made up of the base transformations already contained within DQ Guru. I would then be able to reuse some of the more complex cleansing processes that I've developed.
The idea of 'composite tranformers' (as I call them) or whatever you'd like to call them has come up before, but we haven't gotten around to implementing it. That said, it's a neat idea, and if we can design the user interface bit of it properly, I think it would be a handy tool for making more complex tranformations.
I'll keep your suggestion in mind when we're doing future planning.