vikingr mod has shield bash (i think), crouch, moving ships in battle (although only scripted to move towards each other than fight, a boarding party battle)
also has a horn you can use, and such.
speaking of, i played it yesterday and it can make some more useful shield walls, and nothing was OP about it. You can't move while crouched.
So, there are some features which are possible, you just have to go get permission from whoever made those features and such. And the crpg team would have to accept them.
err, throwing melee weapon is possible as a secondary feature (you want it? go write a script so that you press x or some other button to throw the equipped weapon)
But I don't think the dev team would spend the time to do it, although it could be a nice feature. although if you hit the enemy, you won't be getting the weapon back as that is how throwing works XD
There would be quite a bit to do, like make a double of every model as a throwable weapon... I have seen throwing swords and even maces in other single player mods though. Besides all of the balancing... SO, BASICALLY THIS WILL NOT HAPPEN UNLESS YOU DO IT YOURSELF. (it won't happen. Some reason I doubt they would incorporate it.)