Yes, you’re in the right place. It should be showing there.
It’s not a 7.5 feature, v7 and even much earlier versions are fine.
Very strange, Reaktor’s working for me, in the way we’re wanting here, as a Track Instrument, as well. I’m not sure if that part is a 7.5 thing. Perhaps someone else can confirm.
Hmm, don’t know about the stuck notes.
You might try using the MIDI Inserts panel (in the Inspector) on the track with the synth you’re controlling.
Start with a MIDI Monitor, so that you can see what exactly is being sent from Reaktor.
Some of the other real-time MIDI inserts may be of use in even catching, filtering or transforming the MIDI in a way that could solve the problem. Maybe (it might be worth looking into).
Glad you got it mostly working.