[GNC] User-defined commands

[Helmut Eller]

Is there some easy way to add user-defined commands to the menus?

I wrote some Scheme code for various tasks and currently I execute this
code via custom reports as a side effect.  This works, but it would be
nicer if I could create proper menu items for these commands.  Ideally,
the command would be called with some arguments, e.g. the currently
selected transaction.

Is this possible?  Is it documented somewhere?

Helmut