Hi Shawn,
just seen your email in spam folder.
Can you re-download the macOS package again (clearing the browser cache first) ?
I've recently (2-3 weeks ago) rebuilt this package to include latest GTK library updates.
On double space bar, not sure you can do that with exact sequence, but in general "auto replace" feature should be used for something like that.
In short, you define and activate AutoReplace document and assign it to a group, activate the group.
Then, typing one of the special characters within the note contents will trigger the autoreplace feature, inspecting contents before this trigger characters and if the match is found in the autoreplace document, the match word will be replaced.
You have quite detailed explanation within the 1st note of the demo autoreplace document "AutoReplaceDemo.ncz".
Regards,
Miro