*ka-sproingity-pounce*
Welcome aboard, ODM! Always glad to see new faces around our hearth, don't ya know? Especially bright, shiny, lickable ones!!!
As far as I can tell, there's not currently any way to get our resident dice roller to "mix and match" per your question... looks as if you're kind of bound by one die type at a time. Mayhaps our illustrious webmaster will take a look at that and, when his busy schedule permits, make an adjustment or three that allows such a thing. Until then, though, here's hoping you stick around and maybe even fire up a game or two around here, yes?
Also... moved this thread to Comings and Goings.