pre-checkout/export hook

My company is using Subversion for multiple repositories. Some of the
repositories are for developers that should not have read access to other
parts of the repository. We are using ssh with Windows machines as clients
and as the server. I have seen some messages that talk about just this
problem and that they are looking for a pre-checkout and a pre-export hook,
but no one seems to be saying anything about whether or not these hooks are
going to be implemented. I am a programmer, but not a Subversion developer;
however, it seems to me that it would not be too difficult to implement
these hooks. Does anyone know if there are plans on implementing these
hooks?

 

Thanks,

Eric