Cisco VPN :: 877 - Easy Internet Access Without Split Tunnel

getting internet access via a easy vpn tunnel on a cisco 877 router. Basically we would like roaming users to be able to use the internet via the vpn rather than using a split tunnel. The reason for this is we have multiple sites that are tied down via external IP access lists for some services. We would like roaming users to be able to interact with these sites through the central router and use the routers external IP address to acess the secured sites. I know we can use a proxy but we also use some other non proxy bases services at these sites so would rather direct routed access.