I use RDP from my TP2 all the time and it does not allow me to zoom like it did with my xv6700 (Apache) from HTC. So not sure what has changed. It pretty much makes RDP useless as it really makes it hard to do anything with RDP.
Another annoying issue is the drop down box for RDP (the IP Address) doesn't remember anything but the last connected string. So if you have multiple ips
orts you hit, hope you remember all the IP:Port combinations cause the phone sure doesn't.