The shortcut is Control–Tab and Control–Shift–Tab.
By enabling the Advanced keyboard shortcut setting, you can use 1 and 2.
In the upcoming Opera 12, you can use Command–Option–Left and Right as well.
You can achieve the specific shortcut you wanted by modifying the Preferences file. This is unsupported and I will thus not provide exact steps. There are other examples in the forums and elsewhere on the Web for doing things like this.
Really this is the same problem I was facing 3 months back. My all files were hidden whatever I had downloaded were missing. I was looking for hidden files app similar to this one http://www.showhiddenfilesmac.com, that can easily help me out to display the hidden files I have downloaded.
I have tried,
There is no way to sync yet, but we are working very hard making that happen.
If you are an advance user, I’ll drop one keyword that may make your day better: symlink the Opera Next preference directory to the Opera Developer directory. They will then share settings and data. This is unsupported, but it will work from a technical perspective. (I’ll not help you on the specifics here because you need medium skills to not break such a setup.)
I think there should be option box in Operas options. It's really frustrating to try to create script for command line argument. Really there should be a toggle in Options menu to allow this. Firefox has it already (Always open in private mode).
jugimaster, are you saying you don't want Google to know about your internet activity but you are OK to share it with anyone else who wants to track you?? Because that's what your post sounds like to me.
Btw, I wasn't telling you 'any of that' my post was addressed to shiranaihito in response to his comments.