Here's a quick video on how to group slices using dummy screens in advanced output. Hope this helps
https://vimeo.com/483197549

It should be 1:1. I would just copy and paste your slices you want to group into a new screen. since it's a copy and paste everything should be 1:1.
If you would like me to make a small video demonstrating this, I could get to that later on today. lmk

Wouldn't it be easier to duplicate those slices in a new screen and then just drag in the screen, rather than grouping or locking slices inside the slice menu? Also having them in their own screen gives you the ability to change position and size on the fly if you need it

Sorry, I miss understood. I thought Ctrl+r was already a working shortcut and you wanted a way to map that keyboard shortcut to a midi controller. You're saying that ctrl+r doesn't give you the option to rename a clip. THAT, I am fan of

+1 for this request

This is already a feature

Yes.

Sure know how to build a car though <3

If you're looking to jump into the new Resolume 7, this box is affordable and will get you off the usb dmx path and into artnet:
https://dmxking.com/artnetsacn/edmx2-pro

Not a fan of this request.
Have you looked into Chataigne or Bomes? you can convert a midi press into a keystroke. That might be a solution for you?

I'm not following? In Advanced Output I typically have 10-30 "dummy" screens with no output but just various creatively placed slices. Then inside of Resolume I just drag a screen into slice transform to get the look I want. Is this not what you're sort of looking to do?