On-Call/after-hours/emergency 4 hour minimum premium rate

Could you add an option to log a set minimum number of hours for premium rates, regardless of the actual hours worked based on clock-in and clock-out times?

I am an electrical contractor who performs regularly scheduled on-call duties for a critical public infrastructure client, as well as unscheduled after-hours emergency jobs for all clients.

For both on-call and after-hours emergency jobs, I receive a minimum of 4 hours' pay at 1.5 times my standard rate, regardless of how long the job takes or whether I have reached my weekly overtime threshold. For example: if I finish a job in one hour, I still get paid for 4 hours at the x1.5 premium; however, if the job takes 6.5 hours, I get paid for 6.5 hours at that same premium rate.

Additionally, though less critical, could you add an option for a base on-call pay regardless of whether any hours are logged? For example: whenever I am on-call I get a $200/week base pay as compensation for being required to answer my phone and be on-site within 2 hours of receiving a call, regardless of where I am, what I am doing, or what time it is.