Press Random Key?

[Zzyzxx71]

My rough input is, I'd just do something like this, from the bottom (lowest level) up:
(key 1 = Khat's priority key 1, etc.)

Priority Key 
 |---> Step 1 (reset to step 1 after X seconds; adjust to your taste)
            |---> key 1
 |---> Step 2
            |---> key 2
 |---> Step 3
            |---> key 3
 |---> Step 4
            |---> key 4

Strike key (reset to step 1 after 5 seconds)
 |---> Step 1 (do not progress to step 2 for at least 2 seconds)
            |---> strike 1
 |---> Step 2 (do not progress to step 3 for at least 1 seconds)
            |---> strike 2
 |---> Step 3 (do not progress to step 1 for at least 1 seconds)
            |---> strike 3

DPS key (pressed OR released) 
 |---> Step 1 ("reset to step 1 after 2 seconds" just so your normal first "hit" on any new encounter will be the priority ability(ies).)
            |---> Priority key
 |---> Step 2
            |---> Strike key

Considering the vagaries of ability timings, that will give you a close approximation of "random" without getting all insane with complexity, meaning it's manageable. And it "weights" the strikes toward Festering Strike. You can adjust the progress delays to tune it so it works better with your spam rate and results.

My 2 copper after a quick think, anyway.

OK just to make sure I'm understanding this correctly - make a keymap for Priority (1/2/3/4), make a keymap for Strikes, and then make a 3rd keymap that kicks off Priority+Strikes?

I've never done nesting like that, but if my understanding is correct - I'll give it a shot.

[Ughmahedhurtz]

OK just to make sure I'm understanding this correctly - make a keymap for Priority (1/2/3/4), make a keymap for Strikes, and then make a 3rd keymap that kicks off Priority+Strikes?

I've never done nesting like that, but if my understanding is correct - I'll give it a shot.

Yep. Nested step-based mapped keys. The delays can be a nightmare if you get the tuning on things wrong but if the progress delays are at the bottom levels, it won't be nearly as much trouble to tweak and won't have abstract follow-on effects outside of itself.