Hi @fredericlegrand
thank you for your questions.
1) No, I don’t think changing the order of the plugins you have an impact on the speed. You can have an impact on the speed if you change the loading order of the assets introduced by the plugins. But you can change the loading order of the assets without changing the order of the entire plugins, just playing with the priorities of the hooks that are used to load the assets.
In any case, FDP already gives you the possibility to change the firing order of the plugins. You can read more details here: https://freesoul-deactivate-plugins.com/plugins-firing-order/.
This functionality is not to increase the speed, but to solve issues that you may have if in your installation there are poorly coded plugins.
The order of the code execution should always be managed by the hooks. If all plugins were well coded and followed the best practices, you would never need to change the firing order of the plugins and no matter which plugin is called first by the core.
2) This is a feature of the PRO version. It will be possible to disable plugins depending on the user. If for example, the user has bought something in the shop, you can deactivate specific plugins.
I’m working to make ready the PRO version for the beginning-middle of November.