In the editor, in the General grouping, find the Quality tab. At the bottom left, click "New (Copy)", and choose Celerity as the thing to copy (ignore the message about not being able to save a copy - you just need to look at it).
Then, on the top right, press the "Eval Scripts" button.
So that's how to set movement rates to a specific value.
The next piece of the puzzle you'll need is an augmentation that's not on all the time - something else that, like cyberskates, is activated by the user - how about the Adrenaline pump. That's in the Equipment grouping, Augmentation tab. Note that there, the second instruction in that script is:
Code:
~apply the changes once we're activated by the user
~the Berserker metagenetic quality, if activated, automatically activates
~us
doneif (field[abilActive].value + hero.tagis[Activated.quBerserke] = 0)
So, as you'll see in the comments, there's special handling for the Berserker metagenetic quality, and you don't want that quality to activate the character's cyberskates, so you'll pare it down to just the part about being activated:
Code:
~apply the changes once we're activated by the user
doneif (field[abilActive].value = 0)
IMPORTANT: Don't forget to delete the copies you've made of both Celerity and the Adrenaline pump before testing your new item, otherwise you'll get error messages.