I suggest that aternos should add a "Delete Plugin" button in the Plugins section of the server
Once clicking on the "Delete Plugin" button it will navigate you to another page where you will have choose which plugins you would like to delete
After choosing it will automatically delete the jar file of the plugin you chose to delete
And yes i know that you can do this process manually by going to server files, plugins, and delete the jar file of the plugin you want deleted. But some new users may not know this, and might be stuck with plugins they do not like. But a "Delete Plugin" would probablly be convenient for new users who arent used to managing servers.
anyways thats it for my suggestion hope it gets considered