Bc2000 (for the BCF2000 & BCR2000)

Hi and welcome
> I am a fairly seasoned synth programmer, always trying to get more and more juice from my machines, 

> Problem is that i'm not sure if BCR2000 has the ability to send continuous Sysex data using one of the knobs. Some say it's possible, some say it's not.

It can sen continious sysex, but you can't program this and a whole lot of other things from the unit itself.
As a programmer you have a choice of two editors to write the sysex (and there is also a text compiler) 
I still use my editor (available in the files area) but it is a script editor for the BC language, BCL, but it convert the BCL to sysex and send it to the BC and receive sysex and convert it to BCL.
Easy to learn and there are plenty of examples of other synth controllers.

Mark has produced a great graphic editor that you might prefer. It is much more sophisticated than my mine and sort of hides the the BCL from you. 
I don't think there is anything you can program by script that you can't do with Mark's editor

He also wrote a great pdf where he explains of all the functions of the BCs that we discovered.
Behringer wouldn't give us any info so it is what we have found out from various sources and experimentation. 

Mark has moved all his files to his new website and you find a link in the files section.

> I really love my BCR and wouldn't like to have to sell it to buy something a lot less sexier like Novation Zero SL, which i'm sure can work with continuous Sysex but which i really do not like at all.

Don't sell it.. there are only a couple of things the BC can't do. It has 14bit Midi numbers but some synths (particularly Emu) use negative 14 bit numbers and BC won't do this. There are some work arounds so get Mark's PDF and an editor and give it a go. 
When you get stuck post here and we will see if we can sort it out fore you.

All the best 

Royce