Don't you find it annoying when you mean to upvote a save, but accidently click on the downvote? What's even more annoying is that you can't change it when you do. However I understand why your vote is kept permanent, So here is my suggestion :P
My suggestion is pretty simple, a small "Are you sure you want to do this?" sign that appears when you up or down vote a save. If this was added it would be pretty much impossible to vote a save by accident.
Or you could be more careful where you click... I suppose....
Yeah, the usual "Are you sure? This cannot be changed." Message.
Yes, it should obviously work both ways, not just on the downvote sign.
No, what I am suggesting is, for example, if you click V it says something like 'Are you sure you want to downvote?', and if ^ it says 'Are you sure you want to upvote?', instead of just appearing 'Are you sure you want to do that?'
True story. People ends up paying a lot of attention to downvotes because of those's rarity, so that's a good idea.