miom: If you delete the previous plugin and add the new one the saved settings won’t be removed. When you activate the new version you should get a message at the top telling you that the new plugin has been activated and the old settings (from AdSense Manager v2.x) have been upgraded. At this point it also takes a backup of your previous settings so it can roll them back for you if required.
Version 3.0.12 should be coming out on Saturday. Making it work requires a few fairly big changes to code but nothing too difficult – I have the basics working right now – unfortunately I have an exam tomorrow morning so I will be busy cramming tonight. It will automatically limit ads according to the T&Cs.
Where an ad is not shown because of the limit there should be no white space (it literally does not output the ad, rather than showing white space as Google does).
I’ll drop a note here when 3.0.12 is ready for download.
Thanks for the clarification!