I've done the AP cost table as well, some time ago, when I was pondering on the idea of rebalancing the game. Here's the full table:
Code:
Movement:
1 AP for each tile
Open a door/container: 2 APs
Spell casting:
4 APs for any spell
Attack:
Depends on the weapon's speed:
2 or lower: 8 APs
3-5: 7 APs
6-8: 6 APs
9-11: 5 APs
12-14: 4 APs
15-17: 3 APs
18-24: 2 APs
25 or higher:1 AP
Unarmed is always 5 APs
Skills:
Pickpocket/Lock Picks/Disarm Traps: 4 APs
Repair: free
Misc:
Use an item: 4 APs
Throw an item: free
Drop an item: free
Access a menu: free
Change weapon/equipment: free
Use a fate point: free
Also, if you have the time, it'd be interesting to test the Backstab skill and find out how it works. If we get the actual numbers, it'd be easy to hack it and make it less powerful. It's an overkill at the moment. A full-blooded ogre can't hit more than 67 of physical damage with the Iron Clan Hammer, but my halflings are hittimg over 100 on unaware creatures using some crappy dagger and ignoring all possible resistances, and that's not counting critical hits.
EDIT: OK, I did a bit of testing myself, turns out the mechanics are pretty simple. Here's the basics.
First, of all, a bit of explanation to those unfamiliar with the skill. Backstab adds extra damage to your attack when you hit a creature from behind (3 positions are possible, you can stab straight in the back or a bit sideways). Without training you can backstab only with daggers.
Training:
Backstab Apprentice – a successful rear attack upon an unaware opponent will bypass his armor
Backstab Expert – the Character may backstab with swords and axes as well as daggers
Backstab Master – the Character gains an enormous increase to his chance of scoring a critical success
NOTE: Apprentice lets you bypass the actual damage resistance, so it works with monsters, etc.
The mechanics are pretty simple, the damage added to your attack is equal to the skill level, e.g. if you put 3 CPs in Backstab (so the skill level is 12), it will add 12 to your attack.
Although, when a character stabs an unaware creature (e.g. a stunned creature, a creature that can't see you prowling, etc) the backstab bonus is multiplied FIVE TIMES. So at the full skill level you're doing 100 extra damage to unaware creatures.
There seem to be other factors though, because even at the full skill level a character may sometimes get a backstab bonus as low as 85. Also, I'm not sure how the skill handles critical successes and fails. Critical hits with a weapon are handled by melee skill, the backstab bonus damage isn't affected by them.