First of all, I love it!
now for my first review:
1. I wish that we could do this amazing fx routings without the need to add track per effect. but i guesss this is not possible because of how reaper works. (so we could also make complex effects routings inside one track)
2. I miss the feature to drag and drop plugins from the fx window to hackey machines directly.
3. pressing F10 - showing me your list of plugins and not mine. :P
4. could be useful if Ctrl + left click on the wire Arrows will Mute the connection.
ps - I wish that someone you will work with justin and schwa on reaper to create things like this built in.