I suggested this and got a PM. Haven't tried it yet though:
On Today at 17:43, Mentality wrote:
hey do you remeber that thread, if i remeber rightly you wanted an add-on or patch that would show you as a different status to other people, and everyone said it would be hard work and no one would do it, well messenger discovery (add-on) does it, not as away or as busy but as offline to the individual contacts you select to appear offline to. as many as you want. you can still send them messages and they can send em to to but as it says in the top that you appear to be offline, they wouldnt send em anyways. unless their dumb, or unless you send em a message first to imply your there. plus it does a whole load of other stuff.
http://www.bigblueball.com/forums/showthread.php?t=29652
some adds come up during the install from the sponsors, but they dnt install and your not required to click them to complete the install they stay for a few seconds each then the install continues, i was gonna start a thread about it, but figured id get shouted at lmao. anyways if you decide to use it enjoy, to change the preferences on it, right click the icon in the taskbar an selct options, you'll work the rest out for yourself from there.