Kind of strange...3 days after the successful jailbreak I found out the usage/standby contain no values but dashes; to be honest I must say I also installed some more apps from Cydia in the meanwhile and therefore I am not 100% sure the limera1n is the cause or, may be, Auto3G...Any similar experience?

Not having the same issue here, I'm running iOS 4.1 on my iPhone 4. I haven't yet installed Auto3G on my phone since the upgrade though, just a package I forgot to install. Will test and let you know, but as of now I'm not having that issue.