1. Would it be possible to multiseat X as show here: http://gentoo-wiki.com/HOWTO_Multiseat_X
Along with multiple capture cards to create a multizone security device showing on several screens at once with the capability to switch what's shown on each screen, plus control devices like magnetic door locks through automation.
2. Could I change the PXE boot image, for use in school inviroments etc.
3. Could telephone and TV viewing be set up using a billing plugin, such as the ones available for asterisk. (Does mythtv have billing plugins?)