Custom input

using UnityEngine;

class StickyInput {

    KeyCode keycode;

    // duration after key press that key should behave as if being repeatedly pressed
    float stickyTime;
    float stickyEndTime;

    public StickyInput(KeyCode keycode, float stickyTime) {
        this.keycode = keycode;
        this.stickyTime = stickyTime;
    }

    public bool GetKeyDown() {
        bool realKeyPress = Input.GetKeyDown(keycode);
        if (realKeyPress) {
            stickyEndTime = Time.time + stickyTime;
        }

        return realKeyPress || Time.time < stickyEndTime;
    }

    public bool GetKeyUp() {
        return Input.GetKeyUp(keycode);
    }

    public bool GetKey() {
        return Input.GetKey(keycode);
    }

}