Yes there is a way to chromakey in Preditor, not easy but doable.
First you have to set up the key in Air Command. Put you TMclips and set up the key. Once that is done you can go to Preditor and set up the same TMclips on the timeline with the FX that you have to make in PFX so that you can chromakey in Preditor and if I remember correctly it will work.
Now put that to tape, redigitise it and place it on the timeline.
That is the only way I got Preditor to work with the chromakey.
use FX and make a full screen effect. I did this last year for some PIPs. I bet it would work full screen as well. Also I remember there was a how to on this subject as well. It is somewhere in the archives of TC.
Wouldn’t it be nice if you could drop your saved chroma key picon into Preditor? Hmm anyone even tried doing that? I know I can set a chroma key and save the settings to a picon but until now I never thought about even trying to drop it on a timeline…. Hmm guess i got some playing to do. I’ll post back later if it worked or not.