tcsh was on my to do list for VL 5.9 and 6.0. I'll try to get to it soon. In the meantime there is a VL 5.8 package for tcsh that does work under 5.9.
I have no means of testing xawtv so I'll have to leave that to someone else.
eMachines EL-1300G desktop, 1.6GHz AMD Athlon 2650e CPU, 4GB RAM, nVidia GeForce 6150 SE video
CentOS 6.5 (will try VL64-7.1 soon)
Toshiba Satellite A135-S4727, Intel Pentium T2080 / 1.73 GHz, 2GB RAM, Intel GMA 950
HP Mini 110 netbook, 1.6GHz Intel Atom CPU, 2GB RAM, Intel 950 video, VL 7.1