I don't like it. Unarmed combat at 1d6 a throw is already low in damage (realisticly so yes, not argueing about that). It gives extra options as opposed to say Blade but most of those are unclear and can be interpreted as useless.
If you seperate str and dex you then need 2 good stats to make unarmed work adequately instead of 1. That nerfs the ability for a char who may have say 12 dex and 7str or 12 str and 7 dex. The unarmed combat system is very simplified, but I assume that the reason you can choose str or dex is because your character *chooses* a martial art adapted to her physical nature. So a stronger character may go for a more direct martial art whilst a faster character would go for one that emphasized precise strikes and vital point strikes where strength wasnt so important.
A few of the rules here need clearing up too.
For example, you can use an unarmed attack to knock an opponent prone. That requires a significant action. They can then stand again as a minor action and still have a significant action left. Thats trading your significant action for a minor action. I dont see how thats a good trade. Standing from prone should take at least a significant action and give attackes some kind of bonus.
You can throw someone 3 metres for 1d6 damage or cause them 2+effect damage. Im assuming that the first is falling damage and the second is you twistign one of their limbs to painful and damaging extremes. In which case armour should not apply as defense to either attack. Im assuming this was intended, but its not stated. If they dont ignore armour there is no point to them as you may as well punch them. Of course ignoring cloth armour is one thing but ignoring powered battle armour or throwing someone wearing it seems a little unlikely.
I assume if you throw someone they end up prone? It doesnt say so.
What if you throw someone into someone else? Do they take damage? Or have a chance to be knocked prone?
The original traveller didnt come with a complete combat system. It was all little booklets, and people just improvised really. Things have moved on though

I think a supplement with an advanced combat system and more complete rules would be an idea. Then again I don't have mercenary yet so maybe its in there?
It did have great starship making rules and I enjoyed playing the trillion credit squadron campaign, so not suggesting it was only half done

I loved it at the time. But I'm spoilt now with more comprehensive combat systems about
Aurore