Yeah.i agree with you. The upstream implementation for printing is - let say - interesting. Custom shortcuts is one casualty.
I have been experimenting with some test code to resolve this. Just haven’t had any time to fully complete matters before pushing a pull request to upstream.
I should point out that you can change what action to take when you hit the print screen by changing a different dconf key … org.solus-project.wm … one of the keys there. I cant remember the exact key name off the top of my head but the key description will help here when interrogating via dconf-editor