A small issue, but a  bugbear of mine... on the Jenkins login, the "Sign in" button should always be the last widget. As it is the "Keep me signed in" checkbox is last. The reason this is wrong, is that keyboard warriors (including the disabled), are going to be tabbing between fields. So if you want to check the "Keep me logged in button", you have to then go and tab around the entire browser until you get back to the "Sign in Button". What one wants to do is enter 

user <tab> password <tab> <space><tab><space>

to check the checkbox, and sign in, without resorting to the mouse, and without tabbing twice around the whole screen.

BTW, that criticism also applies to logging into this bug reporting web site.