Here are my home rules, some will probaly be similiar to other ideas though. Also I don't have all the games so I haven't tried all of these out.
Hero's inflict 1 damage.
Monsters have health equal to there strength, bosses(goblin king, golem lord, dark druid, goblin general) have hero packs, some (golem lord, and goblin king) have four health.
If playing battle heroica you may move as many monsters as there are ALIVE hero's. Roll once to determine movement for all monsters.
If playing battle heroica monsters are equipped with their artefacts, however, Ive changed three of the artefacts: the crystal of deflection is used if you loose health dont take the health of yet and roll the die, on a shield the character is not harmed. The chalice of life restores full health on a shield, the scepter of summoning allows the character to place a monster anywhere on the board, you may summon any monster, however the barbarian, knight, ranger and thief can control a strength 1 monster but not control any strength 2 or above monster (they can still summon high strength monsters but can't control them), the druid and the mage however can summon and control strength 1 or 2 monsters as they can control magic better, however no hero can summon a boss and control them.
I think each boss should have there own power but at the moment I can only think of one or two for the dark druid:
On the roll of a shield he can inflict two health of damage on a hero five spaces away even around corners.
If the dark druid lands on a magic space, he may roll the dice again, if it isn't a shield nothing happens, but if it is he may teleport the space and a magic door along with him anywhere.
The dark druid has three health but only does two damage in close combat as he trains mainly at range.
For special powers, potions, etc if it says defeat a monster if means take two health off, just so you cant get lucky and defeat a boss with a single potion.
Bosses can collect items and use them and even buy weapons for themselves as if they were a hero, however they can't heal when dead.
If a monster (not boss) lands on a space with a item they may carry it, the can't use it but can give it to bosses in a 1 space range, if they are killed the item is dropped on the space they died at.
I'll update if I think of anything else.