This is my first post on the forum, and I had to get everything set up to also add my two cents:

Viper is fantastic the way it is. The whole point of the job is the unrelenting offense at the cost of utility. There are no raid buffs, no defensives, and your only cooldown is just doing your fast ability (Reawaken) for free. Removing positionals and potential "busy-ness" of the job would be such a waste and get rid of the main appeal to the job.

If anything the only changes I'd like to see is implementing the Crystalline Conflict defensive Snake Scales for PVE in some fashion, just to give it a little extra survivability for harder content. Every other melee dps has something to give smart players a reward for lessening the burdens on healers or some tool to help stay alive. DRG has Life Surge, MNK has Riddle of Earth/Earth's Reply, SAM has Tengetsu, RPR has Arcane Crest, NIN has Shade Shift. If they don't get that though, it's still fine and all around the most fun I've had on a melee job in a long while.