Is your feature request related to a problem? Please describe.
Once you have added your GSE macros onto your actionbar:

• A- some of these GSE macros directly show the first spell that is in the macro
• B- other GSE macros show the "?" icon (but once you start a fight, the icon changes and displays each spell icon, successively, so this is not a problem)

If you hover these "macros A" with your cursor, you will see tooltips showing the next spell, the one that is ready to be casted:

If you hover "macros B", you can see a small tooltip showing the GSE macro name (and this is very convenient to know where you have placed which macro on which action bar slot):

Describe the solution you'd like

• Let GSE display the spell tooltips if the player hovers GSE macros (in fact, don't change anything).
• But would it be possible to make GSE display the following tooltip if the player presses SHIFT + hovering macros ?
  

This small tooltip (with macro name) is very useful.

If am asking to display this tooltip on SHIFT keypress it's because, I guess, it's not possible to add the Macro name to these tooltips, is it?

Mock-up:

GSE has no control over what is shown. WoW interprets the current block and shows whatever it thinks is appropriate. GSE doesn't interact with this at all.

ok. Too bad.
Thank you Timothy for this explanation.