Modifications that increase functionality without changing rated capacities are usually categorized as?

The correct choice highlights that modifications increasing functionality without altering the rated capacities are classified as minor alterations. This classification is significant because such modifications do not necessitate a complete reevaluation of the system's safety or performance limits, given that the core function and load ratings remain intact.

Minor alterations typically involve adjustments or additions that enhance the usability or efficiency of an elevating device while ensuring that the original design parameters are preserved. This could include adding features like improved controls, enhanced safety mechanisms, or ergonomic adjustments, all intended to better meet user needs without risking the integrity of the established load capacity.

In contrast, major alterations would involve significant changes that could affect the device's operation and safety, and regulatory alterations would pertain to changes that must be made to comply with updated regulations. Cosmetic alterations simply enhance appearance and do not typically affect functionality or compliance. Understanding these distinctions is essential for ensuring safety and compliance in elevating device modifications.