Here's the place for general spoiler-free feedback and discussion about the most recent release, if you want to talk about something that you don't feel warrants a dedicated thread.
Alpha 13 release notes and changelog (http://www.gridsagegames.com/forums/index.php?topic=705.0).
If you want to freely talk about spoiler content without the annoyance of spoiler tags, there's a thread for that (http://www.gridsagegames.com/forums/index.php?topic=706.0) :D. Note that it's fine to talk about spoilers here as well (if perhaps they're only a small part of what you have to say), just tag them appropriately.
So happy you decided to enhance stealth! I can't wait to see how it works!
I'm always up for adding items with new mechanics that can enhance some style of play! There are still yet more in the plans, aimed at various play styles, but any remaining ideas will mostly be left for post-1.0 updates.
Regarding the new stealth items, I'll say now that because it's probably OP the Triangulator won't be such a common find (and it doesn't appear until -5), and no other robots carry it, so the best way to get one would be to fabricate it.
As for the Cloaking Devices, they too currently don't start appearing until -5, and only one type of robot uses them, so you'll probably want to fab those as well :P
(This pair of items add so much additional potential to stealth, especially in combination with one another, that they can't be too easy to get or appear too early!)