I know how to find Knopp's main menus, being the .xml files that are located in /usr/share/mythtv and /usr/share/mythtv/themes/classic/ - but what about the 'sub-menus' (don't know if that's the right term) ie. when you press kbd 'I' in 'Watch Recordings' it brings up the menu from which you can choose Play, Add To Playlist, Auto Expire, Recording Options, Job Options, Delete

I would like to know where this (and similar) files are located, so that I can play around with editing them to add other options.

These menu options are hard-coded in the source. Take a look in programs/mythfrontend/playbackbox.cpp around line 2591 (for MythTV 0.19). The source can be viewed through Trac. I don't know much about programming, but it looks like it could take a bit of knowledge to customize these menus (besides just rearranging them).

Hope that helps

Dave

Wow, thanks for that - yes this is definitely going into the "better leave well enough alone" basket, then!