We modified healing surges in 4e and carried it over with HD in 5e. So in our games you can use a Heroic Surge
Heroic Surges. In addition to healing you can spend HD as follows:
- 1 HD, double your speed for 1 round.
- 1 HD double your melee weapon damage die (dice)
- 1 HD recharge a short-rest feature or ability
- 2 HD recharge a long-rest feature or ability
He also use a 5 minute short rest.
Now to get the Healing Surge of 4e you would need to use the alternate DMG rule and then reconstruct healing magic off of HD. A bit more work than I am willing to do as we don't have much healing magic in my group anyway (no cleric, paladin, or druid)
Also, I have started allowing my characters to use 4e "powers" by spending HD: 1 HD for encounter (x 4e tier) or 2 HD for daily (x 4e tier)