This also seems to conflit with Psionic Visions "Adv. Editing Options for Mods and Admins" located here:
https://vborg.vbsupport.ru/showthread.php?t=98737. When I have it enabled with this hack and try to use a QuickClip reply to a post, I get an error message from what appears to be his hack that reads:
"The following errors occurred when this message was submitted:
You did not specify a username for your post."
When I disable his product the post QuickClip reply works fine but the delete PM issue is still there.