This is a limitation from cisco ios , but all the asa version support webvpn DACL    we actually requested cisco to include this feature in their next IOS release (ROUTERS)   Thanks     

ear Ian_benderaz, Thank god i am not alone on this , Me too having the exact same problem , i can ping to the host ,but no remote desktop . Somebody please help me on this , how enable remote desktop on asa 5505  Thanks