So in the end I installed my own version of LimeSurvey at my hosting. Simply works

Ok, next challenge with this issue: I succeeded for one question, but when I copy that question (and I'll do that a lot as I'll need the same question many times) the relevance equation for each sub-question remains the same. So
- Q1_SQ2 has [tt]!is_empty(Q1_SQ1)[/tt]
- after copying, Q2_SQ2 still has [tt]!is_empty(Q1_SQ1)[/tt] which breaks the idea, meaning that for Q2 and all subsequent questions I need to edit the relevance equation of all sub-questions... which takes a lot of time.

Is it somehow possible to do sth like [tt]!is_empty(this_SQ1)[/tt] or [tt]!is_empty(this.sq_X-1)[/tt]? (as you can see, I don't understand how the this,that and self things work). Then I don't need to do all the adjustments for each copied question.