At least that problem should be fixed fairly soon:
For the rest of the problems, I wouldn’t hold my breath. It used to be possible to switch to a virtual terminal while the installer is running and use a command line partitioning tool to configure the partitions the way you like. Then you could switch back to the GUI and refresh the disk layout in the installer and tell it to use the existing partitions. I’m not sure if that is still possible, but I think it should be. I haven’t done a (normal) fresh installation in a very long time.
Oh, and welcome to Fedora. 