This is a great combat routine so far. Great work. I have two suggestions.
1. Would it be possible to change the opening rotation more in reference to this? :
The "Ideal" Opener:
pre-pull huton (pull happens @5~ seconds to ninjutsu off cd) -> spinning edge -> ir -> gust slash -> bfb -> dancing edge -> suiton -> spinning edge -> trick attack -> shadow fang -> kassatsu -> mutilate ->raiton -> spinning edge -> mug -> gust slash -> jugulate
This is mathematically the highest average damage opener because of the 'snapshotting' of your dots outweighing other setups. After this opener, you will either dancing edge or aeolian edge depending on if you have Storm's Eye being applied. In this context, your huton will be reapplied in the second ninjutsu after the opener; ideally you're fast enough such that your will start a non-huton'ed gcd then cast huton, effectively extending the duration of the previous huton since a 3-step mudra invocation invariably will delay your next gcd.
The in-a-rush-tank opener:
huton as tank is going in -> spinning edge -> ir -> gust slash -> bfb -> dancing edge -> mug -> mutilate -> jugulate -> spinning edge -> shadow fang. Some time a little later into the fight (3-4 gcds~) you will weave suiton -> trick -> kassatsu -> raiton.
I pulled this information from
here and I've tested the difference personally and it's anywhere between a 20-30 dps increase according to ACT. I would love it if someone else could test this to confirm for me and if all is good we can rework the rotation a bit for higher dps.

Also, among my server it's becoming noticeable that opening with mutilate is not ideal and it gets commented on infrequently for me. I can only imagine this is going to get worse as more ppl find optimal rotations.
2. I would like to request a feature that acknowledges another ninja or the trick attack debuff for openers.
I understand if this can't be done or is too complicated to implement but it would be such an awesome feature. Let me first clarify by saying this: on my server it's also becoming a thing to have two Ninjas in the party for 20 seconds of the trick attack debuff. Ideally, having two ninjas in the party allows them to coordinate their attacks so they can have the trick attack debuff up as long as possible. As it stands now I can temporarily bypass this by telling everyone "I'll be the first to apply it" because it falls naturally in Kupper's natural rotation, however, if the routine was optimized to recognize the trick attack debuff and adjust it's rotation accordingly then this wouldn't even be an issue any longer.