Enabling developer mode for the paid server license?

I’m working with a multi-purpose testing environment on a gateway that has the full, paid license.

But installing development versions of modules doesn’t work, because the full license
doesn’t enable developer mode. On the other hand, the full version is also needed
for other use cases: To get rid of the 2-hour nag.

Is there an option somewhere to enable the developer mode on the full version?
Or some other solution, perhaps a combined license for the same price included?

Thanks!

If you tell us your CD-Key that you are currently using we can add developer mode to it. That way you can re-activate allowing you to be in developer mode.