I want a keyboard shortcut to take me to the list of unread e-mails with a specific label.
I can type g + l then type the label name and
is:^u, but I want to know if it can be done with a shorter combination.
I know that it is not exactly the answer you are looking for but, did you ever consider using Labs feature Quick Links. I know that it is not a keyboard shortcut, but with one click, you could achieve what you want to do.
When you have this Labs enabled, simply search
label:your-label is:^u in the normal search field and then, on the sidebar region of the Quick Links, Click Add Quick Link and name this search.
After, it will be a matter of one click to do this search.
Hope this helps.