You mean the aerothurge teleport spell? It does damage to anything it teleports (unless it's immune to damage). No "safe mode".
If you don't want to destroy the fragile object you want to move, pick it up, move it to the spot you want it and let the character throw it without dealing damage to the moved object (drag and drop).
Telekinesis, the skill, increases the throwing range, as well as the distance the character can pick items up.
The tutorial dungeon teaches about how to cover vents with barrels/crates/vases.