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OK, wasn't aware of the 750's hardware restriction.
See config posted in this thread ...
http://mybroadband.co.za/vb/showthread.php/475560-Mikrotik-Routerboard-and-PPPOE-please-help
For port forwarding add something like ...
/ip firewall nat
add action=dst-nat chain=dstnat dst-port=55555 in-interface=ADSL protocol=tcp to-addresses=192.168.1.10 to-ports=55555
For dial on-demand PPTP client to MS Server add the following ...
/interface pptp-client
add allow=mschap1,mschap2 connect-to=123.123.123.123 dial-on-demand=yes disabled=no max-mru=1392 max-mtu=1392 name=MyVPN password=PPPPP user="DOMAIN\UUUUU"
/ip firewall nat
add action=masquerade chain=srcnat out-interface=MyVPN
/ip route
add distance=1 dst-address=111.111.111.111/24 gateway=MyVPN
Note stuff in bold should be changed to your needs.