My understanding is that Mageia is either not interested in providing this functionality or is being discouraged from doing so within the community. I have been running openSUSE Tumbleweed, and very successfully, in my private development projects, but was quickly impressed with the beauty and efficiency of the forthcoming Mageia 6. The 2 distros have a common heritage in many ways.
If you have attempted to install php7 from source, I'd very much appreciate any feedback you might care to share. Might as well shoot for the top if I can.