Yes, +1 for this (and have already a lot of idea of DB part).

But need a complete rewrite of current question ;)

Trick or Treat. Regression or Rewrite.

rewrite => A lot of chance of regression ;)

This will probably not happen before LS 5 or LS 6 because it requires to fully rewrite the way we deal with questions and storing data. There are two main adjustments planned:
a) Making the code more object oriented so questions can use inheritance for certain feature and functions.
b) Switching from the cryptic DB column names at the lime_survey_xxx tables to using question/item codes instead.

The feature itself is actually a must have and something our user are asking for for ages.

« b) Switching from the cryptic DB column names at the lime_survey_xxx tables to using question/item codes instead.» not necessary i think

Not sure if this feature is a must have. LS SaaS seems to have enough users and cashflow without a lot of "must have" features.

But if your users are asking for this feature for ages, my feature request might be redundant. I would expect that you have already opened a feature request.