Horst Schaeffer's other launcher, the menu-based
PopSel, ships with a ready-made System submenu, see screenshot. Qsel doesn't seem to have one, other than shutdown options (though it should be possible to add more).
Having mentioned it, I thought I'd better try out Start Menu X
It replaces the Windows Start Menu, though it lets you revert to that if you want to. It's a lot nicer and more powerful than the Windows default, but it's, well, what did I expect, a Start Menu. That means it points to the c:\Program Files\ and c:\Program Files (x86)\ subdirectory trees. Some of my programs are installed in their own directories off c:, e.g. something like "c:\Programs\NoteTab 7\", and Start Menu X is not as happy finding such as those. I also have quite a few programs "installed" as if they were portable in subdirectories beneath "c:\NoInst\", and it can't find those at all (unless there's a way to add them I haven't found yet). So, for a slightly different reason, I'm like you in needing more than one launcher.
In the course of testing, I found something I thought slightly odd, though it's Windows' fault, not Start Menu X's. You know the Win+I Settings screen. Start Menu X lists it as just that, Settings. I was looking for it under the Windows Administrative Tools, Windows System, etc. menus.
In practice, I generally use PopSel for the programs I use most. I have a few programs in Qsel menus, where I particularly want to group several programs together, though DC member skwire's
Splat might be better for that. Most other things I launch using
Listary's "find and run" feature (I'm a big fan of Listary for other reasons too, mainly its ability to "steer" dialog boxes to where a file manager is pointing). It also has keyword capability, so I can bring up the Listary box and type "blbi" to run BleachBit, for example, without further search. It's a different way of working from menus, but one I like. Mouser's "live search" program
Find and Run Robot (FARR) with similar functionality is practically a religion on DonationCoder.
Start Menu mod