Hello,
There is, you would need pix code 6.3 for this.
The new code as a command management access for these things. In our case the command will be
management access inside. (please check the syntax)
This command will enable the PIX inside interface to talk to the tunnel clients/networks. for example if you would like to access PDM through VPN tunnel you will be after adding this command.
After enabling this command you can initiate the tunnel from within pix by ping destination ip.
eg. ping inside 192.168.3.10. Now the ping command will take the inside ip as SOURCE in the ICMP packet. Make sure you have pix inside ip/network in the crypto acl.
Vikas