I feel like this would be not prohibitively complicated to implement, and would allow me to set some cron job to compare md5sums of what I plugins I have added and what's on the site and download new versions automatically. Currently I have to download the files to compare hashes, I shouldn't need to download files and it reduces load on the site.

For example, if the plugin download for NoGiveNotices is https://umod.org/plugins/NoGiveNotices.cs there would be a md5sum at https://umod.org/plugins/NoGiveNotices.txt. 

You can already see the sha1 for each plugin by adding .json to the end of their page link.