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Currently shortcuts for window do not work well. We can designate only one window to shortcut.

But, maybe I will switch between web browsers by Super+Alt+B? Imagine I was a web developer.

Also I maybe need to switch between windows of GIMP, so press Super+Alt+G?

Another think is to always apply one special window to round switcher shortcut (described in this topic) - window to put our shortcuts to launch apps, so I press Super+Alt+B (if no browser are running) and can click on Firefox/Chromium/Edge/Konqueror/Falcon/etc. ?

Way to implement 1:
1. Add possibility to create window-plasma (plasmawindowing will have option to load/store configuration)
2. Add option to call plasma windowing with selected config by keyboard shortcut
3. Add new plasmoid - taskmanager with option to configure filtering by window criteria and select executable as filter criteria
4, Add new icon property, called KDEID - it will be user-typed app ID. When KDE starts process from icon, it could assign env variable contains this ID. Of course, what with single-process app, such like dolphin/firefox/etc? Must think.

So user could create new plasma configuration, attach it to SUPER+ALT+B, place Firefox/Chrome icons and place new taskmanager plasmoid, For each icon, user will set the same KDEID and set task manager plasmoid to filter by KDEID.