(Nice work by the way, this plugin works great for me. Thanks!)
I set my sublime up to run pep8. Every time I run, it makes a new buffer, and I end up having to close them all. Boo.
When I use Find-in-Files in Sublime, it has a go-to buffer it appends the latest search into.
That seems like a nicer solution. Maybe just "target: 'append_output_buffer'" or something?