Maybe this problem occurs because I've compiled the app using the CyanogenMod Sources. Maybe they are using a different signing certificate for the apps as google. I will try to compile the app using the google sources.
---------- Post added at 11:36 AM ---------- Previous post was at 11:24 AM ----------
My idea is to submit the patch directly to Google. Maybe they will integrate this into the next release. I found a description on how to submit patches to google. (
http://source.android.com/source/submit-patches.html) When the feedback from this thread is good I will try to submit my patch go google.
I also have an Xperia T, but it should work on any rooted phone. Maybe there are problems when other certificates are used as described in the post above. In this case try to install the app using the "Root Explorer" app. First copy the app apk to /data and change the owner to root/root and adjust the rights to rw-r--r--. Then move the apk to /system/app and replace the existing file and reboot the phone. On my phone I was able to replace the app permanently using this method.