Is there a way to insert time for an employee and have it paid at an overtime rate? Example: An employee comes in at my special request and I want to pay them overtime, even though it is not a special day (Saturday or Sunday) and it is not over the hours needed for overtime.

Overtime will only be applied if it fits the overtime rules you have previously set. One way around that would be to manually insert an amount of time. For instance, if Bob comes in for 2 hours on his day off, but you want those 2 hours paid at an overtime rate of 2x regular pay, insert 4 hours of regular time and then add a note to the transactions in case you have to reference it later.