Here's the short summary from what I know:
- Pitch types are already baked into the displayed Stuff/Movement/Control ratings
- The most unique type of pitch is the Knuckleball, which provides benefit beyond its effect on Stuff -- it lowers opponents BABIP and therefore batting averages (but only if the Knuckler doesn't have a Fastball for some reason)
- Arm slot (Submarine/Sidearm/Normal/Over-the-Top) affects platoon splits, Submariners are better against same-handed batters, Over-the-Toppers are more neutral -- this is already baked into the displayed ratings as well
- Velocity affects Stuff and is important if the pitcher has a Fastball
- Converting a starter to a reliever will generally provide a boost to their Stuff rating, the pitchers who benefit most from this are ones with one or two very strong individual pitches
Other musings and findings can be found in the above linked thread.
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