The ease of obtaining Speed boosting mods and the lack of any significant drawbacks might be a problem. We’ll see.
If it is then perhaps there’s a way to modify speed slightly. Something like:
- 1st action: no penalty
- 2nd action: -20
- 3rd action: -40
- 4th action: -60
possibly with some mental stress damage… so it becomes a tactical choice whether to use it or not.