Tronc - Can lieu days be excluded and why some employees do not have a pay run associated?

Just using Tronc for first time and it has been set up to exclude holidays. Is it possible to exclude Lieu days as well? I cannot see any options on the set up screen. They have already received tronc when they worked the extra hours to earn the lieu day, so don't want them to get it twice. 

Also some employees are noted as "not having a pay run associated with Tronc & will not receive any payment".  I thought this might be do with the Job title - but the jobs are completely random from location to location with no pattern attached. I remember our consultant saying sometimes a box which should get ticked automatically when tronc set up, doesn't get ticked - but can't remember where this is to check?

Thanks

Deborah