I just checked that.
I was thinking for it to work you need to have the midi track loaded into BFD3's groove editor as it's part of the BFD3 groove effects engine but I just had a look in BFD3 and that feature isn't there any
more. I opened up BFD2 and it's there,there's a double and half time button but if it was ever in BFD3 it's not there any more I'm afraid.
I'm assuming from your first post that the drums you have for the "excellent" piano piece are from the BFD3 groove library or some other library and not ones you've scored your self?
If I had scored them myself I would have just placed the same notes at different places and kept the tempo.
You can have a part playing at 130bpm but a drummer could be playing at half time which would in effect be 65bpm.
Steve