My stbx only has our daughter about 10% of the time. But he wants 50-50 legal rights when it comes to making decisions about her. When parents have equal rights it is unusual for one parent to have most of the physical custody?

>>>>>>>>>> Yes . Legal & physical custody are separate issues . Most states will award joint legal custody in the absence of abuse or neglect . It provides both parents with the right to have input on issues that affect the child(ren),religion , medical care , etc .