I don't think bluemsx will support cas auto run, even when mounting cas files with the emu gui, you still have to type BLOAD"CAS:",R or whatever the command was, my memory is a little rusty, what i mean to say is the gui itself doesn't autorun cas files

, and iirc i can't think of a msx emu that does

, but blue msx is probably the best msx emu around, are there a lot of cas files available? or were you going to add them to the extras tab like the gb64 team did??