Key repeat not working for application shortcuts

Seems like this is something that broke between XFCE 4.16 and 4.18.

I have a keyboard application shortcut set up which maps the "Audio lower volume" (and raise volume) keys to pamixer commands that raise and lower the volume. IIRC, in 4.16, if I would press and hold the lower volume or raise volume key, XFCE would repeatedly execute the command and so repeatedly update the volume level with just a single key press. This seems to no longer be the case in 4.18. Now even if I press and hold the volume keys, it only executes the command once.

Is there any way to restore the previous functionality? Or perhaps to add a switch to toggle "press and hold" functionality on keyboard shortcuts?