Thank you for the PR, just two minor issues:

• I don't understand why you use ctx.PathParam instead of ctx.Param (in pkg/codegen/templates/echo/v5/echo-wrappers.tmpl), I cannot find the PathParam method anywhere; it's not in v4 nor in v5 of Echo's Context. Upon generating an endpoint containing path parameters, it fails to compile due to the method not existing.
• Another small thing, the options you added can also be added to oapi-config-schema.json (under properties -> generate -> properties).