This one is only made to rebind controller pad keys. You can have a go with the keyboard rebind plugin - but these plugins are more focused on the basic controls of rpgmaker.
If you are using another plugin to make certain keys run common events etc, then these plugins sadly probably won't work.
For custom keys, "at this stage only can assign your own keyname to reference to in script calls."
see in Inputs section here:
https://docs.google.com/spreadsheets/u/0/d/1-Oa0cRGpjC8L5JO8vdMwOaYMKO75dtfKDOet...
(which in this reference sheet, it would mean setting up your own buttonName)
With these scriptcalls, and some creative rpgmaker eventing, you can make those custom keys do other functions!