I am tired to hear that Dr Strange, Goku, Living tribunal etc etc can defeat Alien X.
I am also waiting for those three aliens powerful than Alien X to join Ben Ten.
YOUR ANSWER
I want omitrix to be able to scan anyone and everyone even energy beings as Dagon or Gwen and even non sapient being as ants , etc.
Omnitrix should be based on living essence and not on DNA.
And it should have a feature that should allow user to have mental level at least that of a human.
In simple words I mean even on transforming into cow Ben should have intellect of human,and on tranforming in Brainstorm he should have intellect of Cerebrocrustaceon.
OR
Transformation type Intellect
Non sapient =============================== Equal to user's own level
Sapient ============================= Equal to specie being used