Guys,
Whenever we use the Alternate Keymap it is the (x) Special Key since that is rarely used in any of our installations.
As for improvements it depends on when you started working on them and how much you know about the 5000. There have been a lot of improvements to the 5000 since Mitel bought out Inter-Tel, but some of the features they were working on were never implemented.
Thanks,
TE