Leave the RSS alone.
I don't generally have the ability to play with a mouse, so gunning is right out.
Tired of sword play, have found bombing with the RSS to be both challenging and rewarding.
Spent time, effort and some actual dollars on the RSS.
Unfortunate to lose such an important part of my arsenal.

Make these new bomb mechanics into a fresh family.

Fuse for secondary should be shortened.

Knockback will frustrate others in the party, further alienating bombers from the rest of society.