Hi,
There is a bug (I think it is a bug) on RouterOS 5RC10 in PPP default profiles and rate limit option.
I enabled PPTP, L2TP and SSTP servers on my Mik and I chose Default profile as X and used RADIUS for authentication. Also some manual secrets added for special purposes. Profile X has rate limit of 128k/64k.
I added some secrets and chose service as any because that's what I needed. I also added a special profile named Y with some customized setting including IP addresses but no rate limit and applied the profile to those secretes.
When users with manual secret connect; they authenticate with no problem and IP addresses assign to them correctly but they also get rate limit and I can view the rate limit assigned to them dynamically in queue window.
I did not try to add a server connection for those secrets and It is not efficient for me to do that too because there are too many of them. It seems reasonable that when a secret has a profile other than the default, the connection obey it.