Is it possible to select which network connection mudfish uses to connect to the internet? I have 2 connections, one for gaming and another for everything else.
I’m not sure I’m understanding your question correctly. You mean that you have two NIC (network interface card) on your PC and one is connected to internet and other is connected to intranet, right? If not please elaborate little bit more.
Mudfish’s working based on OS’s routing table. It means that if your routing table entry of OS is pointed to use Mudfish then a connectino will be redirected to Mudfish. If it’s not matached, your default gateway of OS would be used.
No I have a NIC connected to my DSL and a 4G modem I use for gaming. I wanted to try mudfish over the 4G connection without affecting the rest of my routing. If I could bind mudfish to a network connection it would be easier.
4G modem also could be a NIC in a view of OS. 
It seems I need to look your system configuration for further opinion because depending on the default gateway setting and metric values, a behaviour of Mudfish could be different.
If you don’t mind please send me Problem Report for detail logs if possible.
Sure. :-) I’d refunded it.