In Hapkido we have a variety of striking positions for the foot using a front-kick-like motion. What we use for a front kick is to point the ball of the foot, curling back the toes, and using the ball of the foot to impact the target (e.g., knee or groin).
The other day another student and I were discussing: How does this change when using a boot, particularly one with a plate or a steel toe, since this would both limit the range of movement for the toe and also the optimal striking surface.
The question is: When wearing such footwear, what is the optimal foot position(s) and striking surfaces to avoid damaging yourself while inflicting damage to the enemy, contrasted with what you can do barefoot?