Nadav,
I will look into the linked products limitation; I thought it already was limited at three? If they choose 10, do they all show up on the page?!?
As for the categories– I believe we’ll be working on this int he future; however, in the meantime, this guy has generously provided the details and code he has following his work with a developer. He has a configuration that I think is similar to what you are seeking. Scroll down to later int he thread- he recently shared his code and such: