Hello Nite Owl.
Once upon a time I added a ton of compatibility hacks to this oxp to make it work with a range of other oxps that somehow messed with markets or cargo. And of course I quite blindly added a plethora of useful and not so useful features to the oxp. The result was an over complicated mess that was a nightmare to maintain. Those were versions 1.xx-2.xx. Not to mention the pre-Observer oxp called Troomp... With version 3.xx I ripped the whole thing a part, built it again basically from scratch keeping the core and actually planned what to include and what to leave out. One thing I deliberately left out were all hackish oxp compatibilty fixes. That means also HyperCargo which is probably bypassing playerBoughtCargo and playerSoldCargo events. The oxp monitors those and ship's manifest and acts accordingly.
A bit of a long story, but it hopefully explains something.
In short, I'm not planning on adding hacks (unless they are really trivial ones of course) to add compatibility. In this case HyperCargo would require more than a simple hack mainly because it expands the manifest and would require monitoring that too. If, however, someone wants to hack it, go ahead. Just be warned, I've been there
You can probably disable the trader's rating feature by commenting or removing it from the world-scripts.plist file. It's been a while and my memory is a bit vague on this, but that's how I planned it at the time.