NFS over ADSL

[Terry Barnaby]

I routinely access my systems remotely using an OpenVPN connection over
ADSL and use NFSv3 to access remote file systems. Although this works
quite well there are two core issues I have:

1. NFS access does not seem to have any reasonable I/O scheduling ability
    like the standard Disk I/O system (fair usage scheduler). This means
    that a large file access or transfer will end up hogging the NFS
    causing timeouts on other file system access to the remote system.

2. There does not appear to be any real ability for a local, large disk
    cache of the remotes file system. For me this would be a great advantage.

Does anyone know if any of the above are possible with NFS ?
If not does anyone know of a "simple" network file system that would
have the above features ?