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I need participants to press 2 or more keys at the same time. Is there any way to do that? I don't actually need to collect the keypresses, I just need them to press several keys at once to move on to the next screen.
Well, in order to process keypress (saying have to keys been pressed), you need to collect them first. So, no avoiding that. Check out the response history part of the manual (https://osdoc.cogsci.nl/3.2/manual/python/responses/
If you know which 2 keys need to be pressed, you can check whether the last two keypresses were virtually simultaneously and whether they were the 2 keys that you would have expected.
Does that make sense?