If you need to run something at a customers installation using your partner license, it is quite cumbersome:
https://community.dynamics.com/nav/b/stefanodemiliani/posts/dynamics-365-business-central-on-premise-wave-2-changing-license

If it is possible to implement, it would be far better if:
- a partner could log into the webclient and chose to change the license for the current session only.
- then he'll have to uploade his partner license file
- the webclient should show clearly somewhere that a temporary license is used for the session
- ...and the partner can then do the required changes…
- afterwards the session could simply be closed or a button presset to go back to the customers license