Thanks for the kind words, also yes this plugin was designed to work for both mv and mz. :) As for your questions.
1. Yes you may edit/modify the cursors I've provided, and these cursors are free to use in commercial/non-commercial projects. :)
2. There should not be a limit to custom cursors, it should allow for unlimited creation of custom cursors, you just have to switch between them via plugin command.
I'll double check on #2, but there isn't supposed to be a limit on custom cursors.