[UX bug / Feature request] Login by email / login not repeated

I tend to use different pseudonyms on different places on the net and I find it fairly annoying when a website doesn't allow me to use my email (which is always the same) to login instead.

Another annoying thing: in case the password isn't right, I have to retype completely my login. The login page should give me the opportunity to retry without having to reinput (this is another pet peeve of mine in terms of web site usability.)
No problem, those are but small things.
I'll put it on the todo list for next week.
Thank you!