Here is the way that I would like to log in to jira. This is the way the application that I work on is set up, and it makes much more sense.

enter user name
tab
enter password
tab
hit space to check the checkbox to leave me logged in
return

the current tabbing order in jira forces me to do this:
enter user name
tab
enter password
tab
tab
check box
return

I'm baffled why you would ever have log in before the checkbox in the tabbing order.