Remove Customer Portal Form submit possibility

[Luciano_Serino]

Problem: in my organization we have thousands of customers. Customers often submit forms instead of just saving them, than they ask to the agent "please reopen it". This will cause a lot of effort wasted for mistake.

Tentative of resolution: I flagged the form as "keep opened" but in case of submission it will still be no longer editable until the agent reopen it. 

Question(s)
- Is there a way to "hide" or make the submit button not clickable? 
- [if not] how is it possible to request this feature? 

Many thanks in advance.