no, its not quite the same as Ableton scale effect... (but similar)
the idea of the quantizer is you can feed it 0,1,2,3,4,5,6,7 etc... and it will map these to the relevant scale
i.e. light all butttons, and you'll get C, C#,D,D# etc
if you light a C major scale, you will get C,D,E,F
this means a sequencer, can be given a pattern and it will transpose accordingly.
the reason the offset exists is merely to move the notes into a convenient range, this is all to do with the input range being (essentially) 0-127, so if you send in C3 (60) (5octaves*12) if you map this to a 7 note scale (e.g. Cmaj) C3 would now be 35 (5 octaves *7)
(btw: disp/note is handy to help configure it)
I kind of assumed this was how it works in uScale (i.e. a voltage level, determines a position in the scale), rather than Abletons method which more squashes the notes into a scale... I guess I could have both, or perhaps different objects.
( I think uScale/note Quantizer is better for sequencers that have 'free values' ... whereas ableton is better where you are forced to use a 'note grid' / midi)