You mean posting to miiverse FROM running a program in smilebasic? No such way. It doesn't communicate with miiverse at all. We need to do it the old school way like what you did; HOME button pause and log on to miiverse etc.
It would be sweet to be able to access the wireless network on this and communicate with a web server. Oh so sweet it would be! I understand why they don't want to enable it however.