Hey,
Here is the plugin I made for renumbering cues. Basically it does the same that the gMA2 renumbering function does. The advantage compared to inbuilt gMA3 cue renumbering functionality is ability to set a renumbering offset (step width).
But there is one more thing - ability to shift all the numbers by specified value, which is not possible neither in gMA2, nor in gMA3.
I've tried to implement all the necessary checks, to make it impossible to enter non existing cue numbers, not hit the numbers higher than possible for the system and few more others.
It would be nice if you could test it a bit, and I will also be happy if you will use it in your daily work.
Cheers