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To answer your question, I believe there is a skript event for when xp orbs combine so you should be able to cancel that event
Moved to Help
Remember to post in the correct section next time!
To answer your question, you can also use /toggledownfall, a vanilla command to toggle off any rain that's currently ongoing and you can use the gamerule command to prevent any rain from naturally occurring.
At the moment, the admin rank is only for super league admins so even applying for staff you will most likely not be able to achieve it. You can still help the community by applying for staff though!
As @Ruffen said, please make a proper suggestion if you want them to add a plugin. Also, I'd like to point out that the plugin is very outdated and hasn't been updated in 2 years, with the last version being 1.7.9 Locked
Usually when you run the command, you get a fallback error in the chat, but that usually happens when the server is still starting or stopping. Once you got that error, just wait 30 seconds then run the command again and you should be in the server.