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Comfy.n - I have not examined this plugin's functionality, nor will I, but a couple of observations regarding the install.
I installed the plugin in a calibre portable: "D:\Calibre\Portables\Latest Preview", which has a copy of my installed calibre settings. First thing I noticed is that the install creates a SQL Lite database "rss_reader.sqlite" in the calibre portable folder:
This suggests that installing the plugin on a regular installed calibre in Windows might add the file to the "C:\Program Files\Calibre2" directory — if that's what it does, then for me that's a no-no

.
The plugin install also created this sub-directory "D:\Calibre\Portables\Latest Preview\Calibre Settings\plugins\rss_reader", why not put the database in it?
This plugin sets keyboard shortcut values that are already in use, both user custom values
and calibre baseline default values - e.g. CTRL+O has been the default shortcut to open the Book folder since 'forever'.
I raised this same issue in the Template Catalog thread almost a year ago, and more recently in the Calibre Config Reports, and OPF Helper plugin threads.
For curiosities sake I installed your Comfy's Reminders plugin… it has a some keyboard shortcuts, but the install sets them to None… which gets a big
✔ and a couple of

from me
BR