I like that my phone can be always online. However, it spends considerably more time on the internet than I do, i.e. I have a significantly reduced interest in receiving Skype/Google Talk etc. messages/calls when I am sleeping/working/otherwise engaged. Often my friends assume I am online and waiting for someone to talk to me just because they see my status as 'Online'.

My question is: is there a way to cause the N900 to set my Availability to 'Busy' or some other status when the phone locks?

I have mine set to autolock after 30 minutes, and at this point I would like the phone to set my availability to Busy (or possibly even offline). By extension, this would only really be useful if my status then reset to 'Available' (or whatever) when I unlock the phone.

I have poked about in the settings, read the FAQ & suggested threads, searched the forums and have googled the entire interweb without finding an answer to my question. If I have missed something obvious, please let me know [gently]