Since ISboxer has Input Broadcasting which was banned by Blizzard I no longer have it installed to be able to reference. From memory I don't remember if there was/is an option to put in a random delay into inputs though you could have it send round robin (to 1 client at a time so 3 presses of the DPS key to send 1 DPS to each DPS at a time with no mirroring) and that should be able to be triggered via key down &/or key up but that doing it on both up & down could be 4 keys sent to the 3 DPS slots for each 2 keypresses which may not be what you want... While those approaches stopping mirroring you are still broadcasting inputs...
That being said I would not use ISboxer as it is bannable and Blizzard can see what processes are running and instead would use it's replacement JMB or the free and Open Source
www.WowOpenBox.org
Though I used them with mouse over focus to avoid any manipulation I believe one or both may allow you to auto change windows (for example round robin the focus of the DPS windows) so you can get pretty fast actions without broadcasting inputs.
Alternatively you could run 5 PCs (or VMs or Multiseat clients) and have a dedicated keystick for each which could be tightly placed together to allow you to rapidly use dedicated keys to send direct inputs to each client which "should" be compliant as there is no mirroring/broadcasting...
While all of those should be compliant, as I alluded to above, I will never use my main account with any multibox team ever again just because Blizzard has been so inconsistent and I suspect has banned folk which were compliant... I would only use 5 new accounts or 5 accounts which I was fine with losing...
Lastly please do note that not too long after TBC Classic launched I stopped playing & keeping up with the Discords and what not where much of the discussion was as I was both too disgusted with Blizzard and keeping up with all of that took too much of my time (I decided to only keep up with this Forum)... I share that just so you know that there may be some discussions and/or new info that I am not aware of...
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