Firestorm has a gazillion of options... This is what makes it so huge (the binary is twice as big) and so slow...
The Cool VL Viewer is not Firestorm, and vice versa. Same with other TPVs: the argument "X or Y has it" is certainly not a valid argument for a feature request, and usually gets on my nerves...
I do not plan to add this feature (got more important and time consuming things to do, such as the PBR backport).