Addon keeps suggesting usage of covenant ability (only tested NF's Convoke the Spirits), racial (trolls' Berserking) and trinkets while CDs are off.

Covenant abilities are considered rotational and are not subject to the CD toggle.
Racials (Berserking is actually the only racial currently in the APL) already check against the CD toggles.
Trinkets have their own setting if you'd like to turn them off.

Is it possible to considere covenant abilities as CDs like it does in the feral rotation (or all other classes and spec I've tried) ?

Added the CD check for Ravenous Frenzy and Convoke in commit 4cd2b0d