It's basically impossible to itemize augs for a cappable stat. This is because that aug would become worse the better your gear became, and would be siginificantly more powerful the weaker your gear.
It would be possible if augs had a special, overcap contribution that also capped, so you could have maybe 5% more crit from gear augs but no more, or 25 more atk but no more, or 5 more ft but no more. These would obviously be very expensive augs, and would be a great addition to tradeskills, which are right now absolutely the worst reward for time investment in all of sod.
edit: Particularly if they had a cooldown. Say at 250 skill each aug-making class got a /cm command to imbue the limiting component once every day or every few days. If all the other components were currently in the game, or rather common (but still somewhat expensive to create a base cost), the existence of these augs would be determined only by the imbue and would keep the profit margin for aug makers very high, while still having only a limited income each cooldown. All tradeskillers could imbue their own critical resource and then sell it to aug-makers, or simply sell their imbue, or it could make the component no-drop altogether depending on what would help tradeskillers the most in the current economy.