It's a problem with android itself, not only this build. To avoid that you have to use ext partition on sd. In my opinion the best way to use this rom is having big /system partition (it is a way to make it bigger than 250MB?) and move there apps which work to slow on sd with Titanium Backup.
On previous builds i had serious problems with google maps, but I tried now on 10.7 and it seems that even compass is working properly (slow, but in the end shows right direction). Before navigating with google maps in city was impossible, wrong compass directions made navigation loosing route. I'll try using navigation and write later.
Yes, I could try with installing TPT again to be sure, but i don't think it makes any diference. Problem occurs even when screen is turned on, dialer appears after 20-30 seconds since phone has started ringing.