Thank you for your reports. I am glad to see this ROM could be a good base to move forward.
For Wi-Fi, it is only a matter of getting the right permissions. I was able to make it work after setting a few files and it was stable. I will get them right and send a new one out as soon as I do.
I had tried density at 140 as well but Market won't work at that setting so it is better to leave it at 160 for now.
For the hardware buttons, I was able to make them work before. Another one that needs the right permissions.

Permissions is everything in Android it seems.
For the touchscreen, I have used the PDN drivers and yes it does seem more responsive. I will investigate this as well.
Overall, I like the SH20 better so far. I plan to try the Cruz Reader ROM as well to see how it goes.