Hello!
I believe it would benefit animators to have a animation range manager build into 3DS MAX. This has been rebuilt by most of the studios I have worked for because we work with multiple animations in one max file.
Here is a version of this scripted by Dim Walker and modified by myself:

This version saves the names and ranges into the root Appdata so it transfers with the file. Anyone with the script gets the definitions too.
What can this do?
1)lets you define a named range
2)controls the start and end frame of the timeline
3)delete a named range
4)rename a named range
5)re-define a range's frame start and end
6)Sort named ranges by name or Frame start.
7)Next keyframe/previous keyframe
This makes working with multiple animations in a single MAX file MUCH quicker for the animator and allows easier collaboration.
After 20 years, its time to get this functionality in the software as an included part so that team members and students don't have to install it themselves. Note that studios could add custom scripting to customize the manager to do other things. I have mine extended to export out each named range.
Thanks!
-Greg