[codelike]

I've tried out the Foxy Gestures add-on in the meantime. It turns out it has rocker gestures (called 'chord gestures' in the 'Other Gestures' setup tab) and besides the drawback you mentioned (doesn't work in system tabs) it works well so far.

[kk_cz]

That's great news, thank you.

I don't think they're ever going to fix the "system tabs" issue, since it's supposedly a "feature", but at least some good news. :)