Q. Is this really as harmful as you think?
A. Go to your parents house, your grandparents house etc and look at their Windows PC, look at the installed software in the past year, and try to use the device. Run some antivirus scans. There’s no way this implementation doesn’t end in tears — there’s a reason there’s a trillion dollar security industry, and that most problems revolve around malware and endpoints.
Looks like you can use Ctrl+Spacebar to open the “MenuComplete” function that should show you the different available options. I don’t think you can get a direct list of the parameters that have explanations without using something like Get-Help though.
More info here:
https://learn.microsoft.com/en-us/powershell/scripting/learn/shell/using-keyhandlers?view=powershell-7.4