The API now has three FAPI options for buttons.
#skip_validation - Skips all validations, core (#required, #maxlength, and #options checking), and all #element_validate and #validate callbacks.
#skip_core_validation - Skips only the #required, $maxlength and #options checking.
#skip_required_validation - Skips only the #required validations.
Added a mini-module for skipping validation when deleting a user from the user profile form.