Featherfoot the new Refresh?

[Belial]

Even with featherfoot adding mp regeneration refresh could still be implimented (you could cast it on others or yourself) i wonder how much more used and common feather foot will become (imagine whole parties spamming it ^^)

My questions are:
Does the MP regeneration take effect with the use of the ability, OR after the evade? If after the evade, there will be no spamming of this ability.

Also, what is the payback for the MP regeneration? 10-50? 50-100? etc.