Beam Tweaks is a Vintage Story mod by Spoonail. Beam Tweaks makes Vintage Story beam placement more predictable, allowing beam starts and ends to overlap without snapping to another beam's hitbox.

Why this mod is worth installing
It is useful for builders who create layered timber frames, decorative joints, or other structures where beam ends must occupy the same space. It also helps reduce odd beam-breaking behavior in the specified game version.
What Beam Tweaks adds
Beam ends can overlap more consistently because the mod prevents a beam from attaching to the small hitbox at another beam's start. This avoids the placement result changing unexpectedly or the end jumping when construction is completed.
The change is aimed at building control rather than adding new blocks or tools. You still need to target the actual surface behind an existing beam: a beam can appear to float when no valid attachment surface is selected.
For the specified Vintage Story release, Beam Tweaks also includes a backported fix for beam removal. When hitboxes overlap, breaking a beam is less likely to affect an apparently unrelated beam, although the underlying vanilla beam behavior can still be unusual.

Beam overlap can cause placement problems
The illustration shows why overlapping beam starts and ends matter in detailed builds. A beam may jump after placement or attach to another beam's hitbox instead of overlapping it.

Reliable overlap after removing beam hitbox attachment
The mod prevents beam ends from attaching to another beam's hitbox, making overlapping starts and ends more dependable. The image also notes the included fix for beam removal in the specified Vintage Story release.
The image explains that a beam placed behind another may miss the actual block surface because the target is difficult to see. Accurate aiming is still required, and the remaining unusual behavior belongs to vanilla.

Where to download Beam Tweaks
The official Vintage Story Mod DB page is the right place to get the current release through the in-game mod manager.