The eye tracking Pimax provides with 7Invensun is far from what is available for any other headset. As we said in the live stream, there is a massive amount of work and re-engineering put into it (mainly because of the wide FOV), and therefore the price point is different than lets say HTCs eye tracking which is made for 100 degrees FOV. It is unfortunate that we couldnt hold the promise with the hand tracking, but as the whole project just went out of hands in terms of price and effort, there is simply no way we can find to offer this product free, as of now. Luckily, all Kickstarter coupons can be used for this purchase, and backers already got a 100 off the MSRP price.
Dynamic DIstortion Correction is one of the features that WILL be implementet with Pimax tracking, same goes for DFR.
Open Source PiTool might sound like a joke to you, ,but then it sounds to me like you havent considered the possibilities. Also, in a few weeks from now, Open Source phase 2 comes out, followed by phase 3 and so on. If you have no interest in the OS phases, then it might not be something for you. Personally, I have a feeling people will love this. We have tons of ideas already, and with our devs, together with a skilled community, we can do great things for all Pimax users thanks to Open Source.
Regarding lenses, there is a lot I wish I could tell you, but at this point I cant.