You already have to be a fully registered member to download music, and most of them can work it out without bigger problems.
It will make the list of spammers a lot smaller, because they can’t be arsed to go to the procedures of finishing the registration.
We get a lot of spam, it just get deleted before most members realise it’s there, but it’s a pain in the *rse and I think both Mods and Admin could use their time on something better.
So I still say make 1 or 2 mods able to do it, I know it can be a risk letting people into your ACP (admin control panel) but it can be done so they only can use that function.
But… I would think twice about letting people into my ACP too, so it’s really not an easy descision for Admin.