@You : "...Automaticaly repair a topological/geometrical structure with simplifing the base geometry? That's a really hard peace of cake...."

Oh no, certainly not this :)

For the moment I simply want to have a tool (script or nodeeditor) with which perform this task :

1) Select some geometry (whole objects and/or single surfaces, mixed selection)
2) Input a "min" and "max" values that represents the range of the area that I want to search
3) Get, as the final result, all the single surfaces (not joined surfaces) whose area fall within that range, automatically selecetd
(without generating new geometry).

Nothing more than that :)

Thanks.