I tried out Traits beta2.1 and guess what: I missed eCompletion :-).
So I corrected the (eCompletion-) problems to use it in TraitsBrowser
and SystemBrowser. SUnits are green, too.

eCompletionTraits is a branch of eCompletion. So there is no need to
install eCompletion or eCompletionOmniBrowser. But you'll need Shout 4
and ShoutTraits Alpha 1.

Beware: 1) I'm very new to Traits and 2) eCompletionTraits is alpha.

Have fun
Ruben