Best Practice & General Consensus for Ad-hoc Requests

We are new to SN and we seem to be getting mixed advice on the where to, and how to record ad-hoc requests in SN.

The 2 options we have at the minute are;

-Create a custom table for ad-hoc requests

-Record in incident table and set categories as request.

                  The incident table OOB has prefix of INC which doesn't fit with a request and I am concerned this will have a negative impact on reporting. (We currently have this issue with existing                     product)

Version: Helsinki - latest patch