Sometimes you can start seedlings in a taller pot, with less soil. So say a 6" tall pot, and 2" soil. When the seed breaks through the surface, and is about an inch above the soil, add some more dirt to cover the stem up (don't bury the leaves). As it gradually grows taller, keep adding dirt, and repeat until the pots full.
This way, the seeds pop as normal, you control the stretch, and the seedling has an awesome root system.
rapid rooter, smapid pooter, your seeds want dirt.