I don't know if this is possible in LR2.
Out of curiosity, why do you want to do this?
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Thank you both very much for your replies. To answer your question Eric, I have a couple of programs that don't embed the colour space on output (Autopano Pro for example), so I need to know this information when I open the resulting images in Photoshop so that I can assign one (this could be weeks later- the processing is often done in motel rooms or airports on a laptop).
I'm using LR as a browser in this case, and as the thumbnails are created on import it's really quick to view an image and its metadata. On my oldish computer Bridge is too buggy and sloooow.
Secondly I tend to have my tif edits in in either Prophoto or Adobe rgb depending on the perceived range of colour in the photo, on the theory of "why use a bucket to hold a glass of water?". Call me a bit slow, but it helps me to know in advance of going from LR to Photoshop for softproofing whether or not I'm likely to have out of gamut problems when printing.
Cheers, David