Even though Unions don't like flex time, I think it can be good. Please help me figure out rules and details?

An employee who arrives and leaves at his or her whim or convenience, deserves a bit less pay as everyone else needs to work around their non-schedule, so supervisors will occasionally need to ask their best self starters to come to work at an inconvenient time. A small bonus should be paid for each requested arrival. Disadvantage: Some workers will contrive their arrivals, and departures so as to collect these small bonuses for themselves and their friends, but others will try harder to be self starters so as to get a bonus more often. Even the contrivers will get a better grasp of the needs of the company, and thus are potential supervisors. Time and a half for overtime is too much pay, unless the overtime is at employer request, but 10% may be beneficial to the employee, as highly motivated workers accomplish considerably more when they work long hours. Letting self starters work up to 300 hours some months, may be good for the employer, due to improving the workers skills and making a second job (or different employment) less necessary for that employee. Also some employees will arrange their personal schedule to accommodate what they perceive as corporate needs = these employers are potential managers who may prove very valuable to the company. Mediocre people and worse will think it is unfair to give extra compensation to the best of the best, but I think this is a means to advance all of society. Both the carrot and the stick motivate some people. Please more details.