Apache mod_proxy_ftp

I have many web sites that work through an apache reverse proxy (ProxyPass/ProxyPassReverse)..

I wanted to try setting up an ftp the same way..

I have both:
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ftp_module modules/mod_proxy_ftp.so

and:
ProxyRequests Off
<Proxy *>
Order deny,allow
Allow from all
</Proxy>

and:
ProxyPass /ftp ftp://ip.address:port
ProxyPassReverse /ftp ftp://ip.address:port

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This works, kind of, the files are listed, but I cannot click on them.. When I do the /ftp is dropped so the file cannot be found..

http://server:port/ftp
lists directory, then when clicking it shows
http://server:port/file instead of http://server:port/ftp/file

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also, I have no clue how to use an ftp client to access via this reverse proxy..
Thanks