I have no idea Jusc, guys 
there are two possibilities
1. you figure it out by yourself
2. your should check BRouter homepage if there is not any clue
3. we should wait till Arndt return from it's holiday to give us answer
because in API I use, is no possibility to define routeing profiles by myself
Does this mean that the selection in locus GUI isn't used for parameterizing brouter?
Well there seems to be description in readme_service.text but I do not fully understand it:
The configuration concept in the service interface
--------------------------------------------------
BRouter is fully configurable via the use of profile
definition files and a list of nogo-areas, while
the service interface is usually accessed by just
choosing one o the 6 "standard routing modes" made
of a combination of the car/bike/foot and the
shortest/fastest selection.
Therefore, you need a mapping between the standard routing mode
and BRouter's configuration. There is no default mapping
deployed with the BRouter distribution file, so you have
to configure this yourself. You can do that by starting
BRouter is the "normal" way and at the end of the routing
process, press the "Server Mode" button. Then you get
a list of standard routing mode with a preselection,
where you can choose for which of the 6 standard modes
you want to store the configuration just used.
(profile + nogo-list). Please note that the profile
is stored by reference (so modifications at the profile
file afterwards will have effect), while the nogo-areas
are stored by value (so modifying the nogo-waypoints
afterwards will have no effect)