'Private' Questions

I'm using Forms module for a project I'm working on and need to add one new feature....

I'd like to be able to mark some questions as 'Private', and then only allow certain roles to view replies to those questions, i.e. some roles will be able to see answers to all questions, but other roles can see all questions except the 'Private' ones.

Personaly I'll be using this in combination with the Survey module to allow some users to view and comment on survey submitions, but I need to enable the people setting up the surveys to mark some questions as private.

If I do the coding would you be interested in adding this feature?