Well, I know Nekovalkyrja's can :
- Have slightly better senses than humans, especially hearing
- Are a bit stronger and quite more agile
- Have an excellent metabolism and can actually produce some form of self-regeneration (this supposedly makes them hard to kill through conventional means). They can also process matter a bit more efficiently than humans, allowing them to draw nutrients from non-edible materials. They require, however, much more food in the same span of time as a similarly sized human would.
- They have the SLICS system which allows them to pilot some mecha and vehicles as if they were an extension of themselves
- he can produce an E-M field which allows them to propel themselves (hover) in areas with negibible gravity.
- Many of the more recent nekovalkyrjas have mimetic holographic capabilities that allows them to make themselves transparent. This does not carry on to their gear, usually. That same ability can be used to create a few holograms... they can, for example, learn to drape themselves in holographic clothing.
- Nekovalkyrjas can use tactile sight. That is, feel light on their skins to 'see' in a manner nearly identical to their eyes, except all around them. They litterally see through their skins.
- Some have self-cloning capabilities and can give birth of smaller nekos.
The Mindy Power Armor actually shares several of the unique abilities the nekovalkyrja's have... which is why it's called an armor that was made for nekos, by nekos.
However, many nekovalkyrja skills (NH-17, NH-22M and NH-27) aren't really used out of mecha combat, which makes the Yamataians as good crewmembers as the nekos themselves - if fact, they don't even eat as much!
So, essentially, the toning down you've been hearing about concerns lowering the powers of the nekos... since they don't really need them when it comes to power suit combat. Furthermore, disminish these capabilities while making them Yamataians allows the 'converted' nekos to be able to experience another side of life aside from combat - namely the possibility of having children, which can leads to building familly units and so allows a former-neko to enjoy 'normal human life'.
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I don't really know what the ID-SOL's are. I expect genetically breed soldiers with a sharp mind, big muscles and high resilience.