Bc2000 (for the BCF2000 & BCR2000)

The answer may be obvious to people here, but I'm really struggling. 
What I want to do is to use the BCR2000 as an input device to a 
lighting desk. If I kept it simple, there's no problem, I can get the 
encoders to send me values, register buttons etc.

However, what I want to do is to load the BCR2000 with the new scene 
values whena scene changes. I also want the LEDs to reflect the new 
levels and for the encoders to return the correct levels, if they're 
moved. For example:

Let's imagine I'm in scene 1 whenere light 1 has the value 40 and 
light 2 has 50. If I turn the encoder for light 1 up, it should 
return 41, 42... Likewise, if I turn it down, I want it to return 39, 
38...
Now we shift to scene 2 where light 1 is off and light 2 is 75. I now 
want the BCR to recognise the new values and if I turn the encoder 
linked to light 1, it sends 0, 1, 2... Its LED ring should also show 
the current value.

All levels need to be stored in the PC, not in the BCR, which is 
pretty much just an input device with level displays. I do not want 
to store scenes in the BCR.

I've achieved this before witha Yamaha digital mixing desk and 
motorized faders, so I know my software can handle it. However, I 
can't figure out how to get the BCR to do such a simple thing.

Any ideas?