WSO2 APIM: How to implement "Design first" pattern? (Developers cannot test)

We are using WSO2 API 2.1.0 to deploy our business APIs.

Until now, we can follow, without problems, the pattern "Code first" for existing APIs. For example, we have an existing API REST in C#/NetFramework. In this case: - Developer install a plugin, generate the Swagger file, and import ("Have an existing API") in API Publisher. - Administrator deploy this new API, configuring the right backends (remember, the API already exists)

But now, we are going to deploy new APIs, and we want to follow "Design first" pattern. I mean, we want to describe the APIs using "Design a new Rest API" in publisher.

Our problem is that, in this case, the developer can generate code skeletons, but cannot test them, because they have the role "creator" only, and then, cannot deploy "prototype" or "test code" in any way (either in local PCs). Obviously, as API is in development stage, we cannot ask Publisher to publish it.

We cannot add publisher role for the developers, because, then, they can deploy directly in production environments.

NOTE: Initially we thought we have a security flaw, and we have confirmed with WSO2 staff that this is the intended behaviour for security. Developers cannot deploy event in prototype!

Suggestions?