Hi Patchou,
I usually use messenger without menu frame (so I cannot see menus on the top without re-enabling it)...

sometimes I need to use commands from plugins (for example the nes from stuffplug) and, if I don't remember the command "/command", I need to enable the frame, look for command and then disable the frame...

To make all these steps simpler, can you add the options available in the plus drop down menu in the plus icon in the left bar?

Thanks a lot in advance

Although this doesn't really solve your problem, you can "temporarily call" Plus! menu by pressing Alt+U and select its Plug-in item (the menu along with the frame will disappear as far as you select something in the menu, or click somewhere outside the menu). That way, you don't need to click the enable-disable-frame button twice and this will save you some time if you get used to it