I have mentioned this to you last March but it seems to have been overlooked in the roadmap:
I think it would be an important feature to be able to 'prefix' the request IDs so that one could differentiate and easily identify the type or nature of the requests (e.g. Ixxx for information requests, Pxxx for problems, Cxxx for change, etc.).
Of course, this feature would require another one which is beeing able to associate and relate request types to SLAs (i.e. an Ixxx request would/could not be SLA bound).