That would be too complicated. Perhaps the best way to implement this is: if the MONITOR/WATCH limit is N users and your notify list has N users or less, mIRC will use MONITOR/WATCH, otherwise it will use ISON. This would ensure that IRC servers benefit from the decreased bandwidth usage for the majority of their users but for those users who need more nicknames in their notify list, the notify list will still work. I will be experimenting with this over the next week or two.