Bad idea IMO. For starters you'd be taking away the yeast's ability to 'clean up after itself', making yeast derived off flavors/aromas a likelihood (depending on strain). And depending on your method of stopping fermentation, you'd be risking dangerous bottle bombs, too. Better to let any beer ferment out completely, and then make changes to your recipe (mash temp, grist, yeast strain) to finish higher in the future.