Unweighted ranking by itself is a bad idea, I’ve looked at many jams at this point I’m a strong believer in the algorithm we use. Without weighting then something is needed to compensate.
itchio does provide manually ranked criteria, so if you have specific needs for the ordering of results in a jam you host you can set the final ranking yourself. I do not want to add an option for hosts to use a fundamentally flawed sorting method since it will cause more issues than it would solve.
In the future I may spend more time exploring other algorithms, but please trust me when I say that coming up with a formula that works well in a large range of scenarios is not a trivial problem. The most minor changes will have substantial consequences in scenarios that are hard to comprehend when just casually reviewing the results of a single jam. For those that have issues with the current algorithm, they generally always highlight an issue with a pair of games in the overall ranking. It is very hard to adjust the algorithm in a way that would specifically solve the problem they highlighted having substantial consequences on the rest of the ordering. That is why I consider requests like that as someone just wanting to specify the ordering themselves. So, I recommend doing that by using a manual criteria.
Also, keep in mind that the “weighted score” is not how people perceive your game: it solely exists for sorting. Another gut reaction I see is that someone who may get a 5.0 average on category (eg. Graphics) gets a 3.0 weighted ranking feeling upset. That doesn’t mean their graphics are bad. Their graphics may very well be a 5.0, but there are other games that have higher confidence level for the purpose of ordering.