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Yes, it is possible.  In the first action of your process you can pass as an IN parameter the macro "Request.Relative Id" to the form.  The first relative ID for any process is 1.

Note that each request's unique Request number is still the Request Id that WorkflowGen generates automatically and that is predominantly visible on the user portal.  By making the Relative Id an additional DATA element of your process you can display this Relative Id as well in the portal in the same way other process data can be displayed.

Here is the example of the transactions.xml file used (located [DRIVE]:\Inetpub\wwwroot\wfgen\WfApps\WebServices\xmlToDatabase\App_Data):   

      <transaction name="EXPORT2TEXT">   
            <databases>   
                  <database name="EXPORT2TEXT" connectionstring="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Export2Text\;Extended Properties='text;HDR=No;FMT=Delimited';" provider="System.Data.OleDb">   
                        <command type="INSERT" loop="NO" xpath="/NewDataSet/Table1/">   
                                INSERT INTO [CBRE_EXPORT2TEXT]
                                (
                                  [Field1]
                                 ,[Field2]
                                 ,[Field3]
                                 ,[Field4]
                                )
                                VALUES
                                (
                                 '{PARAM:MyParamAsText1}'
                                ,{PARAM:MyParamAsNumeric2}
                                 ,3
                                 ,'{PARAM:MyDateTimeAsMacro1}'
                                )
                        </command>   
                  </database>   
            </databases>   
      </transaction>   

You will require a schema.ini file within the “C:\Export2Text\” folder

[EXPORT2TEXT.txt]   
Format=Delimited(,)   
CharacterSet=ANSI   
ColNameHeader=False   
Col1=Field1 Char
Col2=Field2 Integer Width 40
Col3=Field3 Integer Width 40
Col4=Field4 Date Width 15
comment=my comment

If you do not need a header row (as in this example), set the parameter “HDR=No” in the connection string.  Also, be sure to set Read and Write/Modify permissions on the folder which contains the "EXPORT2TEXT.txt" file.

Reference:  http://www.connectionstrings.com/?carrier=textfile

Question
What is the value contained in the <WF_ACTIVITY_INST_LIMIT_DATETIME> macro? Is it the lead time value (ie: 90 days) of the action or is it the actual date that WFG calculates as the lead time (e.g. 90 days following the action is started/assigned)?

Answer
The latter: it is the calculated end-date (e.g. 90 days into the future), and is cast as a date/time value.

You can do this by creating a sub process and calling the sub process from your main process.  Or you can set an existing process to be a Public sub process and call it from another main process.