Erm, Calixstus - do you:
1) Play Eldar?
2) See any issues with Dire Avengers in particular?
These rules are simply too complex for implementation in 40K.
I know that you will say that you have no issue remembering these (I wonder if you have any issues remembering school work if you are remembering so many special rules
)
However, on a more serious note, Dire Avengers are not particulalry borken, they are actually quite nicely balancd Eldar units for dealing with hordes of lightly armoured infantry. Dire Avengers are not fast objective "contesters" - that's swooping hawks or warp spiders, they are not Tank hunters, that's Dire Avengers or Shining Spears, they are not combat gods - that is Banshees and Scorpions, and they are not MEQ killers, that is Dark Reapers.
Eldar units are very, very limited to battelfield applications, that is the specific hook of the army, there are several smaller niches which could be occupied, but not by Dire Avengers
Oh, and a point of grammar - "a myriad of" is actually incorrect phrasology - the phrase is "myriad" but thn most media uses incorrect grammar anyway...