Hello Marija,
1- Regarding the first part of your question, it is true that the number of rating columns is not limited to 5. Maybe the online help should mention this more clearly. Anyway, I have not been able to reproduce your problem with the disappearing 0 figure from the middle column. When I type 4=0 I do get a 0 in the middle column. See attached screen shot.
2- I will study the feasibility of a display which would better match the Osgood Semantic Differential system, as shown on your last image.
All the best (and thanks again for the Serbian language files.
Joseph