Comment 7 for bug 1793395

I forgot to attach new accels.scm with corresponding shortcuts so I'm adding it now.

Also I think I should mention that those shortcuts are only as powerful as custom actions they match. So the F4 shortcut will not work when many files or folders are selected because the custom actions that this shortcut is tied to also do not work in this situation.

Similarly, the Ctrl + Shift + F shortcut won't work when a file or multiple folders are selected.
This is why reconsidered my initial proposal and I no longer think that overriding the existing Ctrl + F shortcut is such a good idea. It would introduce inconsistent behaviour - when custom action can be applied it would launch catfish and when custom action is not be available, because some files or multiple folders are selected, it would launch in-window non-recursive search. Which is why I think it would be better to use currently unused shortcut Ctrl + Shift + F.
Just to be clear: I still think that introducing default shortcuts for custom actions is going to benefit the users. We just need not to override existing shortcuts.