You can not have enough Foot Switches on Stage. FS1 is wired fixedly to Sustain, FS2 only can be assigned globally. So you do assign it once to your preferred parameter and do not touch it again. So these switches are occupied, if you neet a switch in your special life set, for example the rotary speed switch in an organ life set.
I really appreciate Yamaha to move Foot switch from Global Menu to the Controllers settings. Both, SW1 and SW2 should be freely assignable to any CC Parameter, and stored with the life sets. Sustain, and Life Set+ can be preserved as defaults. Include 'Receive SW' Option to work with the selected controller, instead of working with fixedly wired parameters.