You may download this utility from my
Hotkey Page ShiftKicker is a Tray Hotkey
Install: None. Unzip to an empty folder.
Uninstall: Delete folder made above.
Usage: Hotkey sits in the task tray. Hold down shift key
while clicking the mouse on a Window's Maximize Button
to "maximize" with a TaskBar Gap.
Creates ShiftKicker.ini file in same folder as ShiftKicker.exe.
The size of the gap next to the TaskBar can be set using
the PercentGap ini file option. This is the percentage of
screen width or height depending on the location of
the TaskBar.
Note that this is a "hack" as it just resizes the maximized
window. Clicking again normally restores the window
to its original position and size.
For this to work with Explorer windows the Folder View
option "show full path in address bar" should be enabled.
TaskBar AutoHide option should be disabled.