ShoC has elements of stealth, but like a lot of games it comes down to individual missions only. If you are looking for less run-and-gun I would suggest
Narodnaya Soljanka mod (or
DKZ's mod+DMX if you prefer a darker ambience). Both mods place a very high priority on relationships and allegiences with npc's which drive sub-plots and the entire last half of the game, so where ShoC is basically a shoot-em-up, the mods allow for missions to be undertaken in the conventional manner (which foreshortens the game), or by stealth and/or deception and co-opting game characters. Being of Russian/Ukrainian design there is a large premium on multi-layered plot devices and inter-personal politics.
Be aware that these mods expand ShoC to around four (or more) times the size of the original game, and in keeping with the immersion factor some of the dialogue/mission details etc are spoken only once and do not appear in any log or mission "briefing" you can access. Miss the dialogue and you'll need to go back to an earlier save.
Talking of earlier saves...because of the nature and vastness of this mod, it is adviseable to make saves before every decision -whether talking to an npc (many conversations have a number of different dialogue branches), shooting/not shooting, beginning quests/removing objects/accepting-or not- a mission or even moving into certain areas. Overwriting earlier saves (and area saves) isn't recommended and as such I ended the game with around 800 savegames. And yes, I'm very glad I made them.
Not a hand-holding game even by vanilla Stalker standards. A very high level of intuition, repetition (when you repeatedly fail...and you will) and lateral thinking required.