When you are watching TV and press stop there will show up a "Yes/No" dialog if you really want to stop LiveTV and delete the Timeshift buffer. There is a patch which makes this dialog optional and configurable.

h4. Additional Information
Details about the patch:
Added the checkbox "Ask confirmation when stopping timeshift" to the TV Client section in Configuration.exe. Should be self-describing in this context. The default value is true, so it will leave the current behaviour unchanged.

The General settings tab in the TV Client section does not have much free space, so I found it difficult to find a good spot for the checkbox. I ended up with this: The checkbox is added to the TsReader options group (TsReader is the one using the timeshift buffer). The TV-Server and Group options groups are now placed next to eachother, to create some free space. Not sure if this all makes sense, so feel free to suggest alternatives. This is how it looks with the patch:
http://forum.team-mediaportal.com/attachments/tvclientgeneralsettings-png.122012/

Changed the TvPlugin to only ask for confirmation when the above setting is active. When the configuration checkbox is unchecked, live TV will just stop when pressing single stop on the remote.

GIT branch: https://github.com/MediaPortal/MediaPortal-1/tree/FEAT_Optional_stop_live_TV_dialog (thanks to Oxan)