I don't understand where you are coming from at all. Explain this niche because I have a feeling there's a misunderstanding here.
what about just buffing the accuracy skill a bit again (maybe to 15 or 20%) and leave the actual spread as it is?!
the nieche is that you can "look-shot-hide again" with it, or he mean the fact that you don't need to aim to carefully like with SMG weaponary ;-)
I guess shotgun excels at hit-and-run CQC encounters, where you have lots of cover and wide hallways.
A way of making a better shotgun is making an assault shotgun like the one in spartacuspires. It just rapid-fires shotgun bullets.