API - Updating Requests

API - Updating Requests

Using the API I can create a request using VBScript using the AddRequest operation.
 
Am I correct in understanding that the UpdateRequest operation acts like a page edit on the request and changes values, descriptions etc?
 
If so is there anyway using the API to add conversations to the request, emulating the e-mail process?
Failing that maybe a MERGE process where by I create a new request and then merge with existing so I get the change for full history on the request.
 
Adding Notes will be really restrictive to content etc so would prefer NOT to go down that route.
 
Kind Regards,
Andy

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