Something I wish FTM would support is the ability to identify that a child relationship to a family is questionable. In the GEDCOM the following is valid:
Where status can be: Challenged, disproven, proven
A status code that allows passing on the users opinion of the status of a child to family link.
challenged = Linking this child to this family is suspect, but the linkage has been neither proven nor disproven.
disproven = There has been a claim by some that this child belongs to this family, but the linkage has been disproven.
proven = There has been a claim by some that this child does not belongs to this family, but the linkage has been proven.
IF YOU NEED TO ASK FOR AN ENHANCEMENT TO FTM...
You should ask for them first to follow the GEDCOM then if the GEDCOM does not have the answer ask for a code change.