I found a way to get around it with uBlock Origin for now at least! I posted it over here in the Disable HTTPS redirect thread, but here’s a copy pasta of it for your benefit 
I too found a way to block this using uBlock Origin, huzzah!
You must have advanced mode turned on in the extension settings and then when you navigate to YourIP for your NAS you configure the settings like this:
Once this is set, using direct links like MyIP/apps/transmission/web/transmission.html works without having to go through the admin panel and navigating to the app configure first too! Great success!
