Greetings again. I'm having a similar question right now. (6.0rc7)
I see I can only input integer values in the Bandwidth boxes, aside from the preset ones. Nor 40M, nor 40m, nor 40MiB.
I can write 40000, but which scale are these boxes waiting? Bits? Kilobytes? Megabits? It's not specified in the wiki. Through some quick tests I guess it's Kilobits, but I prefer to be sure.
On the other hand, is there any known way to register more preset values?