Track sensitive for scheduled Airtime shows

Hi all.
I'm testing an "auto dj" liquidsoap solution to enable music when no show is scheduled on Airtime (as described by Sergei, thanks) . My code is :

jingles = playlist(mode='random', "/home/mp3/jingles/")
default = playlist(mode='random', "/home/mp3/autodj/")
default = random(weights = [1, 3],[jingles, default])

s = fallback(track_sensitive=false, [queue, default])
s = normalize (s)

Now, I'd like that the Airtime scheduled shows wait for the end of the current track to begin to play. Is that possible with a fallback "track-sensitive" ?

I don't find the configuration file where this must be done.

Thanks for help.
This software is very nice.

http://radiomandarine.net:9000/radiomandarine.ogg