No-one seems to have mentioned that I, for example,
could easily sign
any comment [[User:Optim|Optim]] and then it would take a page history
and diff to prove that I had tried to assign a comment/vote to Optim.
Obviously this would be madness. The solution is a "legal" one rather
than technical and is pretty simple:
- Don't pretend to be another user.
- Don't change your signature too often. It makes it difficult for other
users to remember who they've built up a feeling of trust with.
(example: If Uncle Ed ever becomes Father Ed, I for one would come over
all confused :-)
Now that's sensible.
There are a couple of users who enjoy changing their nick regularly - I see
that as just playfulness. It's sometimes a little confusing but, as mav
says, it only takes a move of the mouse to see their user name.