You can quickly seek through a video with Ctrl + Mouse Scrollwheel.
MPC-HC can remember playback position, so you can resume from that point later Options > Playback > Output > Audio Renderer.This also has automatic pitch correction. Adjusting playback speed works best with the internal audio renderer.This can be customized to smaller values (like 10%): The buttons in the player that control playback rate take a 2x step by default.Options > Tweaks > Show preview on seek bar.When using dark theme it is also possible to change the height of the seekbar and size of the toolbar buttons.