Hmm. Jakaari ships, like most non-humanoid built ships, will impose a penalty on other races trying to fly them. How exactly is that a flaw, though? Jakaari ships get a free feat for being built for Jakaari? Seems like it might be best to handle that as a trait granted by the constructor race. If you haven't looked at the latest update, I added a rough draft for those kinda rules.
The Jakaari Armor Belt is a little powerful. Magic item Fortification is the closest D&D equivalent. Seems like it runs in the 25-50-75% range, each one being another Feat. There isn't any such thing as Immune to Crits that I can recall. Also, because this has Jakaari in the name, is it Jakaari only?
As for Ultralight armor - the idea is fine, but you can't reduce speed loss by half. Speed is in 5' increments. You could reduce the speed loss by 5'. Of course, taking 'fast' 'very fast' and the like is a better deal. The only time you'd use this feat is when you've already used all the speed feats and *still* want to increase speed.
Dodge bonuses for ECM are way, way too high. The Agile series is giving you 1 point of AC in exchange for 1 feat. Also, if ECM is a dodge bonus, it doesn't stack with Agile (like bonuses don't usually stack). I would suggest each level of ECM gives a +1 Equipment bonus to AC. Mutually exclusive with Stealth, since you can't emit ECM and run silent at the same time.
'Move Silently' feats are simple and easy and something we need.
Jakaari Gravitics doesn't strike me as a flaw so much as a weapon system. Also, it doesn't seem right that a TL7 culture can't make safe repulsorlift type systems. If they were TL5, sure. But TL7? Regardless, the penalty isn't severe enough to warrant a whole free feat IMO.
- "Don't assume you are safe because there is a rational explanation for all of this."