there is one that was mentioned here that will give you a drop down list of the open tabs. i'll see if i can find it so you can decide if it is something that might work for you. also maybe create a feature in opera like multi row bookmark bar addon for firefox, but instead for tabs, something like this:
I do use TabMixPlus in Firefox and it does make tab handling much easier. I don't know of anything like that for Opera.
Maybe it will not be so necessary with the tab button but the tabs are going to get extremely squashed up with the more tabs that are open.