I used to be able to bind any arbitrary shortcut key to launching external applications; in particular, I used to bind Ctrl+Shift+hjkl to a small utility which moves the mouse cursor around.
However, a while back, this stopped working, as now it only seems to allow binding shortcut keys to a single modifier at a time; pressing Ctrl+Shift+j binds the action to Ctrl+j, for example. If I manually edit my key bindings in the associated config file, the bindings simply do not work.
The one exception to the single-modifier shortcuts seems to be that you can bind Ctrl+Super+(anything) to a separate shortcut; however, the purpose of this configuration is to improve my workstation ergonomics, and Ctrl+Super+hjkl are somewhat more cumbersome to press.
Short of completely switching window managers, is there some way to get xfwm to recognize keyboard shortcuts formed from Ctrl+Shift?