I think that dynamic appearance/disappearance of toolbars is not a good idea.
For me it is comfortable to place toolbars once and use them when I want to use
them, not contextually (current object- or action- dependent).
But now in 4.3.2 toolbars disappear even if they have Lock Toolbar Position
option checked. Please enable static toolbar positions.
Popping toolbars may cause attention switch and may lower document author's
productivity. Otherwise you will create another stupid, ugly, non-usable
Ribbon/MFI. I think that many LibreOffice users would be happy with MS Office
Users do not need bells and whistles, they need comfortable and customizable
interface. This interface should allow users to place and pin (lock) toolbars
as they want and use keyboard shortcuts for more productivity (for example, the
fastest way to add Cross-Reference is to press <Alt-i><e>).