Systems, apparatuses and methods for facilitating input function designation. A function of a device specified via a user input is identified, and one of a plurality of sub-functions of the identified function is activated, based on an associated durational user input. One representative function is a keyguard function, and user invocation of such a keyguard function is recognized, where the keyguard function is associated with at least a normal keyguard sub-function and security keyguard sub-function. A duration of the user input associated with the user invocation of the keyguard function is determined and one of the normal keyguard sub-function or the security keyguard sub-function is activated, depending on the duration of the user input.