.
I'm beginning to think Klaus K always puts in some hidden goodies for us.
This time it is a working 'Main Menu' menu editor entry
on the DVD Main Menu at Main Menu>Preferences>Main Menu.

If your persistence is working, you should try this exercise for yourself.
1. Create a New Menu 'Hidden Gems' ...actually a sub-menu of Main Menu;
2. Under this sub-menu, add the following three New Items with Names
Aptitude, Htop & Top. For these three, the command syntax is
for example: lxterminal -t aptitude --command=aptitude;
3. Add a separator; and
4. Add two more New Items with names AlsaMixer & Midnight Commander.
For these two the syntax which worked was
lxterminal -t alsamixer -e alsamixer and lxterminal -e mc.

None of these use the 'Runs in 'terminal emulator' option.

It took longer to write this up than it does to get yours working.
For extra credit, figure how to get vrms to work under this scheme;
I'm stuck there.

If you have some favorite hidden gems, share them with us here and let
us know if there are any peculiar command format requirements.