There is a priority settlement service you can purchase for your application; however, all that it does is put your application ahead of applications without priority processing. Sometimes there is quite a bit of difference between processing times between priority and non-priority (ex. a week versus a month) and sometimes the difference is barely noticeable (ex. 8 days for priority and 11 days for non-priority).
There is no service where you can be assured of a decision within a certain number of days though. Several years back when it was first introduced, the settlement priority service promised a decision within 15 business days for straightforward applications, but now it only puts your application ahead in the queue (without any assurance of how long it will take). I'm guessing the service became utilized so widely that it became impossible to adhere to a strict 15 day turnaround.