I do rely heavily on those who spend time optimizing and figuring out rotation as after work I'm mentally exhausted to even do much and with DPS meters allowed, I figured I'd give a shot at an alternative to implement strictly within the S3 dummies' system. Each idea is something I've seen and should be taken separately instead of as one package. Those who try to figure out the rotation and what not will probably have a better idea but at least this gets things started.
- Skill activation/registered tree
I've seen a a mod feature that shows the executed/registered skills used on the dummy. This would help with identifying rotations easier and seeing where one could optimize at certain points.

- Buff/debuff uptime results
An indicator showing how much we keep our buffs/debuffs up for the duration of the battle.

- 5/10 times feature
Simply defeating the dummy once doesn't mean you are in fact ready. It is a good idea to go through the dummy 3 times to make sure you in fact do have the rotation down. For those who already know the rotation, having them run 5 to 10 times in a row to figure out if the gear is high enough is rather wasteful of our time. 15/30 minutes of combat time only with 5/10 extra minutes (give or take) resulting in 20/40+ minutes. Having a feature where the skill is sent 5 or 10 times and the results show the seconds left or gone over compared to the time limit.

- Efficiency Percentile
While we do have seconds to base our dps on, having a percentage based on how quickly we defeat the dummy. defeating the dummy with 0 seconds left is 100%. Having 32 seconds left can increase it beyond 100%. Maybe include how often the buff/debbuf up on the dummy and self. While I get that this may be complex, its a idea and if others can take this and flesh it further, please do.