Double Attack trait to return, or Momentum?

Here's an idea:

Momentum: Passive trait that, as your character swings their axe, the force generated is utilised to move the axe around quicker for either quicker attacks (think: Self-haste that increases slowly the more you attack, dropping the attacks from 1 per 4 seconds to 1 per 3 second at max cap? Maybe slower/quicker depending on balance) or an additional attack if you miss (like Zanshin, SAM ability. Could have the name mixed up)

And TP gains to be adjusted would allow MRD to function better. What do you think?