Possible Variant rule: Trailblaze

MarchingI was thinking of a fun idea of a “Marching Order”, where basically if you are in a safe position you can move further. Now for the sake of fluff I’d probably call it Trailblaze, since marching brings to mind images like the right (which are still awesome, just not very cowboy-esque).
There are two options I could use. Either a Variant Rule OR a new Trait. How I envision it working is one of these ways, which are valid for either a trait or variant:

Trailblaze: Double Speed if no enemy entity is within 24″. Remove Defense bonus until the start of next Activation.
Trailblaze: For this Movement Phase use double Speed if no enemy entity is within 24″. Cannot perform an Action Phase this Activation.
Trailblaze: +4 Speed if no enemy entity is within 24″.

Pretty neat right? I could see this really giving mobility to entities who aren’t in the fight, but need to be. Sort of like if you deploy badly and need to reach somewhere you can. The downside is either the variant or trait could be exploited in some ways. For example a maxed out Runner being 24″ away and getting double Speed and going 10×2″ in one move. A maximum or cap on Trailblaze would help with this, such as “Double Speed up to 12”.