Welcome to the weird GR setup !
Gotta say however, I have two BCR 2000s fully mapped out (one static BCR preset) including a bunch of plugin specific GR layers, and as long as I export and save after each GR programming session, forgetting is not an issue here.
Even loading the GR setup in another Cubase version works fine, you might have to assign the correct MIDI ports though, obviously.
Do yourself a favour and check out BC Manager, while it is far from being intuitive too, and can't be open alongside Cubase, it gives you access to detailed control over every single button and rotary, you can even remap all the right hand "preset management" buttons for GR too, well worth the headache imho.
In 6.5 and earlier all this works perfectly, if you absolutely have to use 7.x, you better forget about GR and keycommands alltogether and go back to mouse operation, the mixer focus bug (still not fixed) makes any advanced control absurd.
When you tear out a man's tongue, you are not proving him a liar, you're only telling the world that you fear what he might say.
(George R.R. Martin)