For those who play like in real life, it would be great to have the ability to set the percentage of occurrence of each call.
A list of all the calls with a field to set a percentage. According to this percentage the call would be more or less likely to spawn.
Edit : someone said in an other post that some people would set high percentages for high rewarding calls only. So to mitigate this downside, it could be forbidden to set a percentage of occurrence above 5% for calls with a reward higher than XXX+ credits.