>I'm wondering if a review of such things might be possible at some point?

Suggestions for improvements are always welcome. If you have something particular in mind (sounds like you do ;)), it might be a good idea to create an issue about it to get a discussion going.

>I'm particularly keen to see that as3 Flixel does not hold back HaxeFlixel.

I don't think there's anything about as3 Flixel holding back HaxeFlixel. AS3 Flixel has been dead for years, at least in terms of updates, and the HaxeFlixel API has deviated considerably. I also don't think that's an issue, the community is large enough at this point.