VDMX has a function for sliders called "Marks".
Marks allow you to set a value that you can then recall by triggering the Mark via MIDI.
This allows you to take a speed parameter, crank it up for a build up, then press 1 button to reset speed slider to "1" or whatever your default value it.
This would also be quite useful to all of the "/2 : *2" parameters. You can jump up or down, but it would be great to have a "Restore Default" switch next to it that will jump back down to the stored Default.