Hello Josh.
Thank you for your question.
Here are the answers:
Mechanical Triggers are designed exclusively for First Person Shooter games. They won't work in Racing games, that is correct. If you opt to get those, Adaptive Triggers will become unavailable on the controller.
If you want to have flexibility, then possibly the Edge Controller will be a better choice as it offers 3-Position Trigger Locks:
https://megamodz.com/Custom-PS5-Edge-Controller
The set of 3 pairs comes with 3 lengths (11mm, 14,5mm, and 17mm), and 2 shapes (Concave and Convex).
Sold as a set.
We do not remove Rumble Motors at all. Adaptive Triggers only get affected if you select the Mechanical Shoulder buttons option. They don't get removed, they just get disabled.
Hope that helps.