I wish OSU I wish...
Unfortunately this is a service and not a new feature. There has been no change in coding that has made it possible and we don't have a tool, it's all done manually as a service to help players out.
I agree that this should be a feature and IM should be available to all servers. I will speak with the devs on this topic and hopefully get some changes
I don't think OSU is saying to make the IM shop itself available to all servers just the purchased item window.
Same difference, your ap is available on all servers so if K runs out of limited quantity packages, just log on to S server and buy limited quantity stuff you'll use on K after it goes into your purchased item window.
I am not saying it's a bad idea. I'm just saying that's the only problem I can see with it. If you find a way to work around that, such as making limited quantity packages server specific or making them go into your current characters inventory immediately, then great make this feature possible.