Otherwise anyone could run around with it and spray down everything.
Hence my suggestion of a significantly reduced movement speed.
You're too vulnerable while spamming M1 to shield quickly, and you're not fast enough to outrun gremlins, jellies etc.
As for the problem of stationary targets; well, it isn't a problem. You won't be fast enough to dodge incoming projectiles from Puppies, or to avoid Lumbers/Trojans quickly enough.
Sure, the weapon is spammable, but now it comes at a cost - a much greater degree of risk.
That being said though, this still isn't a valid reason for bumping up the damage way too much; it's still a gun by nature.
I have officially started the second page.