Hi Brandon!
I only noticed that the engineId is an integer (you defined it as string):
https://help.rapid7.com/insightvm/en-us/api/index.html#operation/startScan
Everything else looks fine for me.
Before you do the pull request don’t forget to also increase the version number and add a line to the changelog in the help file.
But the ICON team will also review your changes in the pull request.