Many of us are always using first slot like a basic rhythm position for each song.
An Example : For a Song Nr. 1 I use the slot 3 for the solo with delay and chorus ON. In the Song Nr.2 I use the same slot with delay and chorus OFF for the solo. Now I have to step on the footswitch several times to get the sound I want. And there isn't just enough time for that in many songs.
It would by very helpfull to add the possibility of the keeping the changes of the effects on/off within a Performance. This would allow you to pre-select before a song which effects will be active while playing the solo. It would be much more flexible on a live stage and each slot can be used for multiple songs.