In commit 84eed6b0cf9f0b44db5a030018bfca17dae18fd5 which fixes https://bugzilla.gnome.org/show_bug.cgi?id=569612, the key repeat rate configurable range was bumped from 10-110 char/sec to 0.5-50 char/sec.

However, the premise of Bug #569612 mentions:
From http://www.access-board.gov/sec508/standards.htm#Subpart_b, § 1194.23,
(k): 

"(3) If key repeat is supported, the delay before repeat shall be adjustable to
at least 2 seconds.  Key repeat rate shall be adjustable to 2 seconds per
character."

i.e. Only the lower limit needs to be altered. Nothing is mentioned about the upper limit.

Additionally, there are users who do use a higher maximum key repeat rate[1]. I did too, prior to the version of Ubuntu which shipped that commit. Since then I've used the current maximum setting (50 chars/sec), but I would definitely raise it back to my previous setting if it were possible.

Hence I propose that the upper limit be restored back to 110 chars/sec, while preserving the current lower limit of 0.5 chars/sec.

Additionally, a small snippet from #gnome-hackers:
23:38:33 <hyperair> hadess: okay, so reading that bug report again, i see that the minimum key repeat rate has to be 0.5, but it doesn't say anything about the *maximum*, so why did you lower that?
23:38:51 <hadess> I DONT REMEMBER

[1] http://askubuntu.com/questions/140255/how-to-override-the-new-limited-keyboard-repeat-rate-limit