How can I disallow adding item or document to a list or document library? Due to some other feature scenario I cannot break role inheritance and have custom permission set for the list. Today, we restrict the addition using event handler (Item adding) – but this leads to poor UX.
Is there a way to have Role inheritance for a list and still have a base permission mask? Something like, allow everything that parent web offers but not X,Y,Z. Breaking role inheritance in the traditional way introduces the problem of explicit User and role management. Having a SPGoup hold an another SPGoup could help here, but that too is not possible. Let me know your suggestions.