TYPO3 Core

Sometimes we need to have a file mount eg, "all", where some project leadres can put files into and some editors just can select files from to put into the page but delete/add nothing. It is more ore less the possibility to give some BE users a readonly access to a file mount and others a full access. I think there must be others needing something like this.
I didn't find anything to resolve that - the german newsgroup didn't help either (no replies - so I think it's not implemented).
I could imagine something like this: when defining the file mounts, you can say: readonly or read/write. Then you can define two file mounts (one readonly, one read/write) and put them into the proper BE user configuration.
Is this a big thing? I don't know the core of Typo3 to answer this....
/Christian

(issue imported from #M1449)