SFML memory transitions

I do a lot of weddings and small corporate events with this board and like it so far.  I have issues with messy transitions(scrolling between gobos and color from one look to another) between mems on moving lights; MAC 250s.  Is there a way to "move dark" in mems mode for, say 3/10ths to give time to switch gobos/color/move to position?  

Also,  I kinda run the board  "on the fly" because of the unscheduled speech, song change, etc.  mems seem to be the most flexible.  If I run in sequence, I have to quickly scroll the encoder to the right scene and fire it on time. mems is quicker.  Is there a way to recall a button or fader to a look I can recall anytime anymode?

Thanks