Total Commander

Configuration->Operation->Mouse selection mode

Left mouse button mode don't let you select multiple files using only mouse, and it don't let you use dragging to select multiple files, that's not very comfortable for me.

Right mouse button mode don't let you bring up a context menu by left clicking on a file/folder(you have to hold left button for it), it don't let you drag file to copy/move/create shortcut/7z files/filders - thats not very comfortable for me too.

Middle button is not involved in any file operations, so middle button selection mode would be very comfortable.

This is done already in the TWinKey plugin. The feature is called "Retractable selection". The color and transparency of selection can be configured.

Thnx a lot thats fantastic.