To answer one of my questions:
For those who might want to remove all the factory user presets.
1. First backup all of them in the Editor -> save it to say file-name "original-factory-presets"
2. Unplug the USB cable from your Express or Shortboard foot controller.
3. Exit and restart "Spider Valve MkII Edit" - You'll notice now it's empty with Defaults - now you can plug-in the USB cable to your foot controller and "Send ALL" to your Amp to be saved. or what I did is since the Default still had a few things enabled
I disabled them in the editor then sent ALL to the amp.
Anyways.. the factory user presets are great and lots of fun so very few will need to use this trick above but I did it cause I did not enjoy the Volume spikes.. oh, that's another thing I set the Defaults to Volume 10.. well the first 12 I did.. I wasn't about to go through all 64 of them :) besides, I'll only be using at most 16 for my own presets.
That's all and I think for my other Question it might be possible to assign FX-1 through 4 to a FBV Express controller using the MIDI software for your foot controller but then you lose Channel switching function so I never did try it yet but it might be possible - instead I ordered a Shortboard cause it has a few extra buttons like Gate on/off, loop, etc .. does it all basically :)