Cyclocross touring, studs for SPD shoes?
Unless you plan to do a lot of sprinting up muddy hills to jump barriers, the studs are just extra weight that makes annoying noises when you're walking around. 

SPD is great for touring since you can easily walk around in the shoes, the studs detract from that without adding much benefit. 

You can get small "set screws" to fill the holes where the studs would go. This prevents
the threads getting filled with dirt in case you decide to use them later. 

https://www.boltdepot.com/Metric_set_screws_Allen_Cup_point_Stainless_steel_18-8.aspx