Hello, installing RDP6.1 seems not be a an easy option for the moment. It seems you need to have Windows 2008 and Vista or XP sp3 on the client side.
This is what Juniper says, but it doesn't seem to work:
WhatÕs New in IVE v6.0
Version 6.0 of the SSL VPN software includes several new enhancements aimed at improving WTS usability and the overall end user experience. The first enhancement allows the use of a universal printer driver through the WTS proxy, avoiding the need to install numerous third party printer drivers on terminal servers for every userÕs local printer.