We can't. AFAIK there are no user exits in SD that would allow changing standard table controls. And making modifications in the standard code is not recommended. These days the UI solutions, such as Personas, exist that can be used to customize how the transaction looks.
Kindly search before posting, all the possible SD user exits etc. are well documented and discussed numerous times on SCN. The techniques to identify user exits / BADI can be also find using Google.