[Last Gasp] AP Regneration & Limited, Move Only

[Humabout]

I am trying to sort out a price for Limited, Movement Costs Only as a limitation for AP Regeneration. The idea is to give the character a minimum amount of movement available every turn for the sake of more chambara-like fights. It's not a campaign feature, so I figure I do have to price this one out. My initial feeling was -20%, but I'm not sure if this is too steep. Anyone try this before or have any suggestions or insight?