I just finished writing a new widget that may be helpful to some of you Opera Desktop Team enthusiasts. It reloads the latest builds every 5 minutes by default, but can be configured to any interval.
The widget is very simple, and if you want to test it before it’s available from the Widget repository then you can grab it from my site here.
The current version as of making this post is v1.0, but I’m going to be releasing an update soon to notify you when a newer snapshot build is available and also show in the widget the current build that you are using so it’s easier to reference. 
If you have any comments or suggestions please leave them on the widget page here. Enjoy!