PMASHA - to your first point. If there are pilots who bid stretches of days OFF and then call sick fatigued then deal with them as individuals. Making blanket rules is counterproductive.
MORE IMPORTANTLY, if this is the case then the company and rostering must ensure that they do not do the same with roster compression - yet that is EXACTLY what rostering does.
Pro Rata basis?? What is the pro rata value? If we have, for arguments sake, an exact 4 week month and a pilot has 2 weeks of leave then in the remaining 2 weeks he should HALF a regular roster. Anything above that amount should be overtime. But that NEVER happens.
Worse, they assign 4 or 7 days of leave and the pilot still flies 90-95 hours? In other words--company roster compression.
To put it bluntly - it's unsafe.