To scrub the animation with the mouse but without dragging:
1.Go to Customize > Customize User Interface. On the Keyboard panel, click in the Action list and then press T to jump to the T section. Scroll down to find Time Slider Capture Toggle and click it.
2. Click the Hotkey field and then press a keyboard combination to assign as a keyboard shortcut; for instance, Ctrl+T. Click the Assign button.
3. Close the Customize User Interface dialog and then press your hotkey for Time Slider Capture Toggle.
4. Move the mouse left and right without pressing any buttons. The time slider moves in tandem with the mouse. To exit this mode, press the hotkey again or click any mouse button.