from googling it looks like that's the only option now, there's a workaround but i think it removes all tab restore capabilities :/

http://my.opera.com/community/forums/topic.dml?id=1709732

the opera website it telling me to go into settings > preferences > general or press ctrl+f12 and i can find start up options there

but i don't see preferences or general anywhere and ctrl+f12 just brings me to the settings page i was already on that doesn't have that option anywhere so i think that info is outdated argh

gdi opera y would u think restoring old tabs all the time is a good idea and remove the option to opt into that