Not sure if you already installed the Experimental Window Switching part, leaving it here just in case:

    Click on Switcher in the rcmd menu
    Scroll to the bottom and click on Try experimental window switching
    Install Hammerspoon
    Install the rcmd script

Screenshot: https://lowtechguys.com/static/img/rcmd-window-experimental....

After that, you should be able to press Right Option + Equals ralt-= to assign a key and an action to the currently focused app: https://files.lowtechguys.com/rcmd-window-actions.png

If assigning doesn't do anything, try restarting both Hammerspoon and rcmd, there can be a race condition when the script is installed the first time.

Wait -- why do I need Hammerspoon to trigger an AppleScript that I wrote?

Actually, now that I think about it, isn't this easier to do:

1. Write the AppleScript (done) 2. Save it as an app 3. Assign a right-command to that app. 4. There is no step 4.

Hammerspoon is needed because App Store apps are sandboxed and can't focus specific windows, can't run arbitrary scripts and AppleScripts.

What that gives you is the ability to map Right Option+letter to specific windows or tabs of the currently focused app.

So in your case you could dorcmd-s for Safari then ralt-m for mail tab, ralt-h for HN tab and so on, and it can also open those tabs/windows if they aren't already open.

And you also get a visual switcher to see what your options are in case you tend to forget these shortcuts.

Here are some examples of how I tend to use that feature: https://files.lowtechguys.com/rcmd-window-actions-h264.mp4

I'll have to make it more discoverable and user friendly though.

Ah, okay. Did you know that AppleScripts can be saved as "apps"? I'm happily launching the mail tab in safari by pressing rcmd-m without Hammerspoon or anything other than stock RCMD. That gives me everything I was looking for. It would be nice to be able to assign ralt-<letter> to launch different apps -- e.g. rcmd-m does gmail in Safari, ralt-m opens Messages. and rcmd+ralt-m could do something else entirely.

I've used Windows at times, but I don't miss window switching beyond the above use cases.