Allow two-character highlighting shortcuts. If the user types a letter and as long as first letter is ambiguous, wait for a second letter. If the first letter uniquely matches a one-letter shortcut, then use that one. That will open up a whole bunch more possible shortcuts. Also allow numbers. So I could do N1, N2, N3, and P1, P2, P3, etc. Would be very helpful for my numbered highlighting styles:
