The penalty in wpf is the same. It applies to for all weapons.
The thing is that archers need every little bit of wpf they can get their hands on, otherwise they will have big trouble hitting stuff. A sniper (crossbowman that can shoot over half the map) will also go light armour so he keeps all his wpf too.
But for a hybrid you would want to be at medium/short distances, maybe a bit further too, and thus would want not as high as you can but something to still be accurate. Thus having something like 140/110 would be really good for a hybrid. 140 in your main weapon and 110 in your secondary.
Here is a melee/crossbow build I just made.
Level 30 (4 420 577 xp)
Strength: 18
Agility: 21
Hit points: 59
Skills to attributes: 8
Ironflesh: 3
Power Strike: 6
Athletics: 7
Weapon Master: 7
1h/2h/pole: 140 or 110
Crossbow: 110 or 140
You can wear some armour before the weight penalty applies. I don't remember the exact number but it was 7.X or somewhere around there. Not that anything beneath 10 will have any serious effect tough.
NOTE: All head armour weight is multiplied by 3 and gloves by 2. (so a helmet weighting 1 will be counted as a weight of 3 in the calculation)
Might not remember correctly here about which has x2 and which has x3 but they are there. There are a lot of threads around if you want to check up more on it or you can continue to ask me. I might not be able to answer everything but I hope this helped.
EDIT: Forgot to add. The weight on your equipment (weapons, shields, arrows, ladders, horses) does not affect your wpf. They do affect you running speed tough.