Hi Kyzrati,
Like in the title, this is just suggestion, low-priority, currently I simply copy-paste into new image then do the regular CTRL+SHIFT+E, usually using in combination with the killer 'D'-depth.
Hey gumix, so you're talking about making a palette from clipboard contents? I'd say that might be just a
bit too specific for something I'd want to add as a feature, even in 2.0. Unless it turns out it's easy enough to add via a new menu system and doesn't add too much clutter, but in general I think it might have too few use cases and the alternative to achieve this effect isn't very onerous compared to how often anyone might use it (as you say, using an empty image as an intermediary).
I guess I could ask more about how this sort of need fits into your workflow, like how frequently and why you need to do this.
Fun fact, I run RP on ubuntu (with wine), there is a key-stroke collision with gnome's text input. By default pressing CTRL+SHIFT+E starts to produce emoticons. Remapping it to use <Super> modifier additionally fixes the problem.
gsettings set org.freedesktop.ibus.panel.emoji hotkey $'[\'<Control><Super><Shift>e\']'
Aw, too bad REXPaint doesn't have the same remapping support that I added for Cogmind, something I should do eventually... (pretty time-consuming and error-prone though, not a great solution)
At least 2.0 would likely have a more in-depth menu system that also allows people to have alternatives to so many hotkeys.