Hello Draken,
I want to first say thank you to you and your team for your work. I have been a fan of translation teams for many years but have always been a leech (waiting to simply download and play, not that that is a bad thing) rather than contributing.
I also am an avid collector and have many of these games in their original languages. (though many I cannot understand I still play, they are great!)
I do have some experience beta testing, though I would say a moderate amount at best. I am a native English speaker, have a fair amount of time, and am absolutely meticulous with game exploration and documentation.
I would like to give something back to the retro-gaming community for a change and if you still need help with beta-testing I would like to offer my help. Let me know if you would like another beta-tester. If not, then I just want to say as an avid retro-gamer, thank you again for you and your team's time and effort. Teams like yours have helped to share wonderful worlds and their stories with gamers around the globe, and it is so greatly appreciated, thank you.