Is there a proper way to edit apk files in general? I pulled the framework-res.apk from my phone the other night to change the sliders on my lockscreen. I used winrar to zip the framework apk and then went in replaced some images, none of them where .9 images. After I swapped images, I pushed the framework back using ADB and my phone instantly reboots every time. When my droid comes back online, the images changed so i figured it worked. But now I'm experiencing some problems, such as, I cant install anything from the Market and, my installed applications have seem to reset to their default settings and I get random FCs. That's why I'm wondering if I'm doing something wrong or if there is any easier, correct way to edit APK's? Could it be that I'm on a CM rom and that's giving me problems? I don't know.
Also, I belive if you edit third party apps like Tweetcaster, Rom Manager, etc. you have to auto-sign them, correct? But stock apps you dont?