Now that we have transport belt capacity increase research it would be nice if there is a loader that can have this functionality as well to create denser belts,

Given we can reach speeds where some builds actually require items stacked ontop of the fastest vanilla belts of throughput (take for example processing unit with electromagnet plant's and 10 beacons+ speed modules with turbo belt requires 10 belts of green circuits if you don't stack them(allowing 32 items per belt instead of 8)) it would make sense for a stack loader or something like that to do a similar functionality

Funny you say that. :) This is exactly the thing I'm working on now.

It would be nice to have Loaders which can do this, yes. It's disappointing that Wube have sidelined their own internal Loader tech, so I'm not expecting any of the "real" loaders to ever get this feature. As much as I like Factorio, its over-reliance on Inserters is stifling.

Funny you say that. :) This is exactly the thing I'm working on now.
I saw that while looking into the code to see if you had left something in there that i could change to or otherwise adapt for it but glad to know its being worked on i cant wait