Exactly as the title suggest.
Add a toggle key when in the building mode to turn on or off, snapping for all Tileset pieces as well as certain decor, augments, and lights.
Such an addition will free up build time and not hinder the creativity of the basebuilding Realmwalkers!
It'd be nice if they would improve the orientation function of flooring if it's going to have directional models and textures, as well.
Nothing like placing a piece and needing to delete it because the hologram didn't make it clear that it was laying wrong because the outline is indistinct. This is something that Ark actually did pretty well by having an arrow to indicate an alingment direction.