tadb

We have several groups with different interests and different skills that would like to share blocks of time. Each individual may want to do solos or 2-ways or 3-ways, etc. Does anyone know of some software solution to create a rotation list so that everyone gets full use of the time they actually paid for? (e.g. if someone is doing 2-ways they would get twice as much actual tunnel time because they're sharing with someone else) Thanks