I have been trying for some time to use the Behringer BCF 2000 in touch automation mode, and I noticed that some other people did so without success, too. So I digged into the source code and came up with a workaround that allows any of the buttons of the BCF 2000 to be used to start/stop touching (currently limited to gain automation). More details (and the patch, of course :-), are available here:
http://tracker.ardour.org/view.php?id=4199
I just finished this feature and wanted to share it immediately, but haven’t yet used it extensively, so I can’t say much about usability, but I think it’s cool anyway 
Kind regards,
Markus