I found something in the Quadruped Guide included with mGear. I use mGear 2.5.24 with Maya 2018.3
If I import it & change the guide scale (made it BIGGER) , then I build the rig, the ((world_ctl)) controller size didn’t scale with the whole guide
Not a big issue but if you need to massively change the guide size, your world_ctl later may not be like how you want it.
waht about scaling it in component mode?
@Hazem_Mahmoud That is the expected behaviour. I should improve this calculating the bounding box, but is not priority right now 
Yep it works,
but needs you to be careful when doing it, as it also activates the component mode for all the other controllers linked to world_ctl , To not select any other vertex for another controller by mistake or something (& of course you will need to repeat this each time the animator needs to scale it if he/she scales the rig)
, i thought for a while about that indeed (it might be needing some calculation for the whole guides scale to guess the world_ctl later after building), just add it on the notebook for later 
