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I've searched around for the answer to this question, I may have found it but not have understood the answer. I've primarily worked with Linux based firewalls, with some PIX experience. <br />
One Function that I was always able to easily do is what I refer to as a SNAT. <br />
Example Source IP (192.168.1.5) Destination IP(any) Service (RDP:3389) &gt;&nbsp;Change Source to:(1.1.1.3)<br />
This would force 192.168.1.5 to use 1.1.1.3 as it's external IP address only while using RDP:3389, all other traffic would use the default MASQ.<br />
I dont want to port forward 3389 to 192.168.1.5, I want it to use 1.1.1.3 as it's public IP when using the port 3389<br />
Where all other traffic defaults outbound to 1.1.1.2<br />
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Is this even possible with a PIX / ASA ?<br />
If so how?
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I've searched around for the answer to this question, I may have found it but not have understood the answer. I've primarily worked with Linux based firewalls, with some PIX experience. 
One Function that I was always able to easily do is what I refer to as a SNAT. 
Example Source IP (192.168.1.5) Destination IP(any) Service (RDP:3389) > Change Source to:(1.1.1.3)
This would force 192.168.1.5 to use 1.1.1.3 as it's external IP address only while using RDP:3389, all other traffic would use the default MASQ.
I dont want to port forward 3389 to 192.168.1.5, I want it to use 1.1.1.3 as it's public IP when using the port 3389
Where all other traffic defaults outbound to 1.1.1.2

Is this even possible with a PIX / ASA ?
If so how?

NAT Clarification

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).