After inviting someone to join Wikidot, so that he could become a part of my site, he commented on how the password limit is at most 20 characters (he wanted a longer password, 28 characters to be exact).

It would be great if this could be extended to, for example, 28-32 characters, or even longer. Generally the longer a password is, the more secure it is.

As mentioned by bcammo in IRC (#wikidot on irc.freenode.net):

<brycecammo> I think it's a good idea to create the wish. If people want to create super-long passwords, let them.