These suggestion are fine if manpower is sufficient, but they will always be trumped by operational requirements.
Someone may ask for 3 months off to look after the family, but if there is no one to backfill them, the request will be denied.
I have the opportunity to work from home, and when I have an appointment from the Gasman or whatever, who tell you they can visit 'sometime between 8 & 5' it's a godsend.
But I can take my laptop with me. Anyone in a technical role won't have that luxury.
So if an individual looks at others and find that they have flexibility and they don't, I'm not sure that it will entice them to extend their service.
Its an idea worthy of discussion, but it has to be applied to all, not just some. I imagine that it will cause more problems than it will solve.