Details
I have a form that is using mappings. If the form is being filled out for the first time, I'd like to insert the data into the database.
If it has previously been filled out (by the current user), I'd like the entry to be updated.

Question
Is there a way to do this with RSform!Pro? I don't mind hacking the component if I need to.

My thoughts so far
I thought that perhaps I could use 2 forms- both identical except that one form inserts and the other one updates. To do this though, I would need to determine if the current user has filled the form out before and then provide a link to the appropriate form. Since the link will be shown via another component, I'm not sure that this will be a viable option.

I'd appreciate any thoughts on this issue.

I haven't tried it yet, but I think I may have found a possible solution thanks to this post
http://www.rsjoomla.com/forum/37-rsform-pro/19516-ajax-form-submit.html#19516
The information at http://www.malsup.com/jquery/form/#options-object was also very helpful.

Solution?
It's a bit of overkill but I think I override the submit buttons normal action and post the data to a php script (using url). Then I need to write my own DB handling functions into the php script to (1)check whether the form has previously been submitted (2)to insert/update the DB as appropriate.

This would mean that I don't use mappings at all as the php script I send the data to will do all of that.