FTL's have for too long been treated like a game, like tax loopholes. The game is to find the loop holes and them exploit them. Why? Profit. Either it is to avoid employing enough crews or to avoid what are seen as non revenue generating night stops. It's a game, but the referee is often awol or turns up late, and instigator of the game owns the ball. What to do? Crews need to apply the rules in the spirit in which they were written. We all know there is no chance of writing a set of FTL's to cover all scenarios. There are many Ops manuals that contain the tongue in cheek phrase, "Airmanship is an SOP". Roster instructions should contain the phrase, "rostering practices are to employ humane common sense". It should not be tongue in cheek, but actual SOP.