Where to set 'use_blender_profile' option? I have seen that the Collada exporter uses a flag called use_blender_profile. 

Looking at the source file, it seems that this option allows to export additional information in the Collada file : 


connect to say if the bone is connected to its parent
tip_x, tip_y, tip_z to tell the length of the leaf bones


Without these values, the information is lost as Collada encodes the armature differently.

But where and how use_blender_profile can be set ?
Am I right about the exporter behavior ?

The blend file :
You find the setting in the exporter's option pannel:



Note that this is a new option (added in june 2016). This option will become available in Blender 2.7.8. Of course you can download the most recent nightly build. There you should find this option as well.