Is there a way in 3DXChange to disable or delete foot and hand contact points ?

I'm not quite sure what you are looking for, but in iClone you can enable or disable hand and/or foot contact (Modify panel).

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76% of original size (was 661x19) - Click to enlarge

I have both foot contact and hand contact untoggled but exporting FBX from iClone still gives me the extra bones in Maya and it looks like the floor controls in 3DXChange.
76% of original size (was 661x19) - Click to enlarge76% of original size (was 661x19) - Click to enlarge76% of original size (was 661x19) - Click to enlarge

Is this a custom character (non-CC or iClone)? Because I don't think I have ever seen this.

Hopefully there is some Maya expert out there to help you.

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76% of original size (was 661x19) - Click to enlarge

This is a character downloaded from another software but the asset and skeleton are clean when importing. Hopefully, someone can help.