I´m a bit late to the party, but... While Twilight render has other main purpose, looks like in the Pro version it has tools that allows to select edge loops: https://www.twilightrender.com/index.php/component/content/article?id=187:twilight-render-tutorials-tools

Hope that helps.

I registered just to say thank you for this BRILLIANT plugin!
As a side note, I have Windows Vista and SU 7. No problems at all. The plugin is working fine for me.