In version 1.3, it was exactly like that. Then, under the unanimous cries of "Imba! Imba!", the current version was made.
In general, for all specialists in secondary skills, the bonus is a percentage (except for the specialist in Fire Magic).
The problem with scouting is that the specialization cannot give a half-cell bonus (half of Fedor :D), so it's interesting to know at what level, with expert scouting, does it give a +1 radius of vision? I'll venture to suggest that if it gives +5% per level, the increase is at 1 (4 cells), 7 (5), 14 (6), 21 (7), 27 (8). If I'm right, then that's quite a lot, especially if you get it out of prison :D. Please correct me if I'm wrong.