I do not know what other tools do to be honest, but if they are brain damaged, so let them be 
They just seem completely unobvious. If I want to set a limit on the bandwidth normally it is to “split” my overall bandwidth in several parts, so I’d expect to use “network speed units” (e.g. Kbps, Mbps, Gbps, …). I am not trying to limit “volume downloaded over a unit of time” (e.g. MB/s, KB/s, GB/s). It’s been a while since I’ve done professional network equipment configuration (only doing “paper” these days…) but I seem to recall both Cisco and Teldat limiting clients using Kbps or Mbps…
Maybe I am the strange guy here and you would like to ask other users?