Just some food for thought - I have done alot of striking arts [Boxing and Muay Thai mostly] and have only really started to get into grappling work, and I know for a fact, that in a stand up fight, I can knock some of the BJJ guys out with absolutely minimal effort, but let a fight go to the ground, and I'm getting arm-barred, or triangled, or just plain choked out [I remember my first take down attemps, absolutely laughable].  Flip side, a buddy of mine has done BJJ, Akido, and Judo for near on 20 years, yet his punches and kicks are a little bit pitiful, and totally not for lack of strength.

I am training in Muay Thai and BJJ with a little bit of background in Krav Maga and Defendo. I agree with you that striking and grappling are two different worlds, but I feel that the latter still correlates more with BAB than with Athletics. But like I said this has nothing to do with Size anymore.

Put in a larger context there are a whole stack of skill-on-skill actions in the combat chapter specifically to prevent combat from devolving into "BAB is my most important/only offensive value," and "defense my only defensive value." In fact there are so may different ways to strike at a character that no character can reasonably be expected to guard against them all. There is no perfect tank - players need to cover for each other and GMs always have a case full of Kryptonite at hand for every character.

Yes, I have no quarrel with your logic and the other skills in the combat chapter work fine. However I strongly feel that all martial art efficiency should come from the same source. No matter if your characters tries to head-butt, roundhouse kick and take-down an opponent, it should always use the same ground work. This is not specific for Fantasy Craft. When I read different RPGs and find for example that punching is a skill but wrestling is covered using base strength attribute, I want to grab the game designer and scream. I am special that way and cannot be persuaded any other way at least when we are derailing the thread  

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Because the point of grappling was to give characters a means of damaging foes that is not based on your BAB.

I understand now what you were getting at and it is fine if that is what one looks for. However I have trouble imagining such a drastic difference between a straight knee kick (BAB) and a knee kick delivered in a thai clinch position (Grappling). Also BAB should be in my opinion the character's standard measure for hurting others. Still I can see your logic behind the ruling and it is easily house ruled 

Why use Athletics at all? If you are using Defense for resisting Grapple then why not roll for normal attack using the exceptions listed under Grapple? Skill vs Defense looks messy to me as a one time special rule.

1) the easy one...just drop the rule. Clean, and restores the balance between weapons codes;

This is the way I would go. Having rules for handling one-handed weapons  two-handed is quite trivial. A lot of games do this but I don't think it really gives anything back. If you start considering the pros and cons of two hands versus one hand, then you will end up using different damage modifiers for thrusting and swinging, rolling for hit locations etc. Not worth the trouble I say.

Assassin is up! Looking forward on reading the rest 

Another natural addition would be a fantasy bestiary.  You could all it a Creature Manual!  Or a Monster Compendium!  Or something like that.  

Small, dedicated PDF booklets of monsters like Dinosaurs, Undead, Arabian Monsters, Giant Insects etc. would also be cool.

It would probably be cheaper and less time-sucking for Crafty to just post an official conversion document.

I am really not that interested in buying SC expansions but I am willing to spend 5$ for FC material.

there're a couple of threads about Oots already around...

Sorry about that, I am new here. This proves that there is a demand for OotS for FC 

While I am delighted with the wide range of player race options in Fantasy Craft, I think that not having centaurs is a major omission for a fantasy rule set. This in mind converting something like the Origin of the Species: Light of Olympus to Fantasy Craft would make me a happy and somewhat poorer gamer.