Hi Dave, you have added them to the correct place, it is normal behavior that you don't see any changes in the UI. You can launch a command you have installed by either pressing Tab once to put focus in the XYZ input control and then type in the command name there, or set up a shortcut key to launch it.

There is a description of this on the FAQ here:
https://moi3d.com/wiki/FAQ#Q:_How_do_I_install_a_plug-in_script.3F

> As I mentioned to Pilou, have seen screenshots of different folks interface and it has extra
> buttons at the bottom for such commands and scripts. This is what I'm looking to duplicate
> for quick easy access.

Those extra buttons are not part of the standard MoI UI, they are added by a UI mod called CustomUI which you can get here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=6507.1

- Michael