If leading a charge is about you and all your dudes seizing an enemy position or whatever, then yeah, seize by force is sufficient. If you are leading cavalry through supply lines or a surprised enemy camp, you are going aggro.
But if leading a charge is about your effect on the men behind you, then you've got a custom move waiting to happen. Maybe you are leading a charge to raise the morale of the other troops, or to help another unit, or to escape a bad position. So it could be two moves in one, you help somebody, then you have to roll to see how well the men behind you acquitted themselves. I dunno exactly what that would look like but I can think of a few others...
What happens when troops are frightened, impressed, or dismayed? They rout! And when they rout, you gots to rally 'em:
When you rally the troops, roll+hot. On a 10+, all or as many as makes no difference hear you cry and rally to your position. The rout has stopped! On a 7-9, only a small cadre of the most determined troops rally around you, while the green boys and cowards take their leave. On a miss, your troops are broken, and the enemy is upon you.
When you fell an enemy leader, roll+hard (or, I dunno, roll+enemy's rank?). On a 10+, this devastating sight throws panic through the ranks. They break and run. On a 7-9, the enemy's leadership is broken. Individual units pursue their own impulses--not all of which will be to flee. On a miss, the enemy is possessed of a more-than-competent successor, and now they want revenge.
When you resupply the front...
When you set fire to the enemy (i.e. flaming arrows or burning oil)...
When you seize the enemy's supply train... (roll to see how much you get in the way of provisions and stuff)
When you scan the enemy ranks, looking for weaknesses, roll+sharp. On a hit, ask questions from either read a sitch or read a person, but ask them about enemy units or the army as a whole, not about individual people. On a miss, you maneuver yourself into a bad spot. Better roll that charge move, Light Brigade.
For moves in a gladiatorial arena, I can see stuff like the Quarantine move where you pick how much damage you can do and/or s-harm. Or...
Cat-and-Mouse: When you inflict deadly harm on an NPC, you can declare them still alive but helpless before you, instead of killing them. They will continue to stumble about, but will not go down until you give them the coup de grace.
Coup de Grace: When you kill someone, roll+cool. On a hit, they die gloriously. On a 10+, choose 2. On a 7-9, choose 1:
* It is sufficiently bloody; the crowd's love is yours.
* It is sufficiently distracting; take +1forward against the nearest enemy.
* It is sufficiently fearsome; your other enemies hesitate or stall and you retain the initiative.
* It is sufficiently skillful; the nobles' respect is yours.
On a miss, your weapon is stuck.
(or you could just use artful & gracious)
Can't think of anything else offhand...