Ramming Damage with a large weapon mounted Options

[evilgenius]

Hey all.

I have a player who wants to generate a pretty interesting character who'll use a melee weapon while passing the target, driving by on a vehicle (motorcycle).

He's wanted to know how driving by quickly would affect hitting somebody with a combat axe, monosword, or something similar.

I figured that I would add one to the damage for each extra step on the ramming damage table, but also a penalty of one die on the melee test.

That would be:
speed: 21-60 meters / turn, -1 die to hit, +1 to damage, but a one die penalty to a vehicle test to not wipe out.
speed: 61-200 meters / turn, -2 to hit, +2 to damage, but a two die penalty to not wipe out.
speed: 201+ meters / turn, -3 to hit, +3 to damage, but a three die penalty to not wipe out.

Does this sound reasonable? Should it do more damage than that?

Also, he enquired about mounting a "lance" on his bike. It's a sick idea, but he's looking at ramming people and skewering them with a big honkin lance, mounted like a side-car. I told him it would be an epic pilot vehicle test to not wipe out, but he's fine with that...

How would a lance modify the vehicle ramming damage? I was going to say that it would provide armour penetration -4 or something, and maybe +1 damage... Is that reasonable?