Maybe you should consider accepting that since ages movies are deleted by pressing Menu on the selected movie and choose delete there ...
I don't really know if DMM will change back the function of the red button in the PVR window, because by now this wasn't requested by any single user here (except you).
But have you tried alternate PVR-Plugins? They offer are better functionality than the original one, so I would really recommend to try them. I think some of them are provided by the official feed of DMM, so you don't even have to try a different image (like Merlin and Oozoon) or the Gemini-Plugin.
Didn't know you could press menu.. and I must honestly admit that I did not try to press menu.
But I did now, and it's working... so sorry for this thread...
But I learned something new 
You have to install the plugin enigma2-plugin-extensions-movieselectionquickbutton.
After restarting Enigma2/GUI, the red button will delete selected movies without pressing MENU. To change functions of the color buttons just open MENU - Plugins - Setup MovieSelection Quickbutton
Thank you.. Now I learned 2 things today 
I don't really know if DMM will change back the function of the red button in the PVR window, because by now this wasn't requested by any single user here (except you).
They don't have to change anything back as this has always been default behaviour If you're using tags (you need extra plugins to add the tags) the other color buttons filter the list by these tags.
