Zoom Shortcuts

I like the new Full Extent Zoom and Detail Zoom options for the timeline.

Could we get shortcuts for them as well?

Shift-z always worked fine for me. I don't understand what these new buttons add.

They work differently.

Use Shift+Z to see the entire timeline, then click the Full Extent Zoom. You may well see a slight change, with the latter better filling the available space.

The Detail Zoom seems to be a preset Zoom level independent of the length of the timeline and well suited to trimming at the frame level.

I find them useful. I think shortcuts would be even better.