This is one product they have - and I think its an interesting concept. There are definitely a few times something like this would have been handy.
They also have a variety of glides similar to vera locks, and others that will connect the cable to a threaded end:
These can be seen at: http://www.griplocksystems.com/rigging/productcategory.cfm?id=1
While I would be hesitant to use these for standard theatrical rigging, I think they could be very useful in non-critical locations.