You can zoom the microSD card recording timeline in or out by using spread and pinch gestures on the timeline element.
If you tap the view pane while watching microSD playback, you should see several on-screen overlay controls, including those to navigate forwards or backwards in 30-second increments.
Since you described your post as a request with a desire for more precision while viewing microSD playback, you may be interested in these existing Wishlist topics:
As with any Wishlist topic, you can visit those to click or tap the Vote button above the initial post and share your ideas and use cases in the comments to show your support for the product and feature request/suggestions that are important to you.