Stop mouse interfering with Cmd + Tab menu
Keyboard Maestro provides an Activate Application Switcher action that you can map to cmd + tab in a macro to replace the OS X application switcher.

Within the Activate Application Switcher action there is an option Enable mouse rollover selection that is on by default but can be disabled. This won't be a seamless replacement to the OS X application switcher but it's something to try and see if you like it.