It appears from the workflow that the current answer is no. This is curious. I do know that I have submitted documents in the past with no clear submission spot and I had them accepted. This option appears to have been removed. How disappointing in general.
In this case of misapplied payments, this is a very frequent error and should be added.
In the case of non-specified issues, I would really like to see a way to add frequently requested non-specified requests. Faxes are no longer welcome or reliable. Mail to CRA is unreliable and untrackable. I have even had Registered Mail items go missing for weeks until a TC manager finally tracked it down. I can only guess that the burden of routing the non-specified requests in the online workflow had been overwhelming and was eliminated and put back into the call center workflow. It may have been a bottleneck and response time issue. Of course, I am just guessing. Overall this is very disappointing especially given the very long wait times and lack of tracking or proof of request with the call center.
From the current Rep A Client screen this the workflow…
Rep a Client
None of the above
Then you arrive at this message…
Only certain documents can be submitted through this online service. If the action that you want to take is not reflected on the previous screens, mail the documents to your tax centre.
Pasted from https://apps1.ams-sga.cra-arc.gc.ca/gol-ged/gzgs/racupld/prot/slctflbx.action