Yea that can be a thing to though I think you should be rewarded with the MS for good gameplay and serpent sting isn’t.
For example Surv is supposed to be a melee/ranged hybrid in arena so making MS come from mongoose bite rewards survival hunters who are good at knowing when to go in with the MS.
Barbed shot rewards BM hunters for not just spamming all their abilities.
MM again is the hardest one for this but Aimed shot is definitely something that takes more thought then other things.