I think a simple detection and message to donate in order to hide ads to the user would be sufficient. Doesn't have to detect if banners are hidden or shown or invisible (or does it). Just needs to detect (in most cases) the adblocker. Sites like Channel 4 detect adblocker, because it can block the adverts on their TV programmes. Rather than trying to force the adverts, it just doesn't allow you to watch anything until you disable adblocker for their website. I would say that was an extreme case of dealing with the issue. Was just proposing a simple message to ask the user to disable adblock, but I think a link to the donate page would be useful too. I said it because if members and external clients are paying for advertising space on your website, it makes sense to do our best to ensure they get seen. As this is an 'if' case, then I agree with the config option.

Attached is a patch for v9 that implements this functionality. Would need updating for whatever version this might get merged into.