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I agree with adding an additional field for each release of XOOPS that can be checked when the module has been proven to work with that release.
Please note that this is going to be something that will need to be checked again in 2.4.x, 2.6.x, 4.0.x, etc.
As an alternative sugestion, you can post a comment on the module itself after you have checked it out.
So if you see seventeen people have checked out a module and their comments say it works on 2.2.x you got a higher level of confidence that this will work properly than if you see two people have checked out a module and say that it works. Obviously, you can post comments if you have problems with a module.
Hope That Helps.
Regards,
Roberto Artigas
If you move one grain of sand at a time to the same location eventually you will create a mountain.