Propagate folder permissions only for selected identities

It would be great to propagate folder permissions only to selected identities instead of all identies.

Example: I have a folder A with two sub folders B and C, where both B and C have a lot of displays and further folders. On folder B I added an identity IdB with write access to B, on folder C I added an identity IdC with write access to C.
If I look at folder A I see both identities IdB and IdC with read access on A which is fine.

Now I want to add a new Identity IdA with write access to A and sub folders.

If I add IdA to folder A with write access and propagate this, it will not only propagate the write access of IdA but also propagate the read access of IdB and IdC. This way the write permissions from folders B and C and all sub folders will be removed!

If "propagate" would only propagate the rights of the selected identities this problem would be avoided.