Bike Rental Manager Ideas

When service points get depleted, logging a service in the maintenance log jumps the SP's back up to 100. It would be great if each maintenance job should have custom SP's added to the bike. For example, Bronze service replenishes 25 SP's, Silver service replenishes 50 SP's and Gold service replenishes 100 SP's. Also if SP's could be depleted based off time used (1 hour=1 point), this would be much better as a bike can either be used once in a day, or 8 times but the service depletion is the same.