With the RB750 (or any other device running RouterOS), you can simply run a script to "hard-cap" the connections yourself.
Here's a script of mine that would hardcap my IS connection at 10GB.
Code:
# Derived from http://wiki.mikrotik.com/wiki/Automated_Usage_Script_without_usermanager
/interface
:local i [find name="PPPoE IS local only"]
:local content [get $i bytes]
:local posSlash [:find $content "/"]
:local bytesup [:pick $content 0 $posSlash]
:local bytesdown [:pick $content ($posSlash+1) [:len $content]]
:local bytestotal ($bytesup + $bytesdown)
:local megstotal ($bytestotal/1048576)
:if ([$megstotal] > 10240) do={
disable $i
:log info "Capping at $megstotal MB"
}
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