It would be nice to add a source address option to PPP clients such as PPTP or L2TP. (like the one that radius has)
I know one can do it with Pref. Source option of static routes but think of a case that I have a VPN server with multiple protocols support (each for different purposes) and with a single IP address.
At the client side router I have multiple IPs from different ISPs and I want to make different VPN/PPP connections to the above mentioned servers but with different source IPs so my traffic goes through suitable ISP of my choice. Having the mentioned option in RouterOS will really save a lot of time and energy.