I often try to hit the "Add parameter" button multiple times in a row, because I know I need a certain number of parameters, and I just want to get them created and then start filling in their information, almost like a spreadsheet. However, Inventor doesn't allow this because it requires a name for the parameter before moving forward. Hitting "Add parameter" multiple times does nothing, and if you try to hit Enter before giving a name, Inventor throws an error.
I suggest that new user parameters should be given a default name, e.g. "Param1", "Param2", and so on. After hitting "Add parameter", the entire default name would be selected, allowing you to immediately type in a desired name like you can now. However, you could instead choose to keep the default name for now, and go straight into setting its value or creating the next parameter, whatever works best with your workflow.
This would make it quicker and easier to create parameters in the way that works best for you.
It would also be more consistent with most creation operations in Inventor (new part, new feature, new sheet, new View Rep, and on and on) which don't force you to provide a name up front, but instead start with a default name, and allow you to provide a more descriptive one whenever you're ready.
Related idea: Improved keyboard navigation in Parameters window