I've done a staff type change (from bass clef marimba to sus. cym staff) to insert a 2-measure sus. cym. roll.  When I hit the midi key i(G5) t displays the note way above the new 3-line staff.  I was wondering if there is any way to fix this, given that it's bass clef and not treble, which is more typical.

It's G6.  Remember, in the manual it all starts on C1.

You could put in a clef change and hide the clef so it would not appear that there is a clef change, then change back to bass clef and hide that one as well... if it's aesthetics you're worried about :-)

OT - Did Bill know that from memory?

Yep.

Bill is the man!!!