I've played quite a few different mods lately and having observed the animations and stats of certain weapons I got a few ideas.
A thing about pikes: Make them work like they do in Deluge. Give them a high stab and make them unable to block. Make them support weapons again. They were never meant to be the duellist's weapon of choice so you might as well fix it in terms of realism and balance. Pikes are huge and rather cumbersome so blocking with them would require a lot of space, time and strength and it'd be next to impossible to block a sword coming straight at your neck in time, if the assailant was standing right in front of you. Of course a situation like that would be very unlikely seeing as the pikeman could just let go of his pike and get out his sidearm, be that a katzenbalger (my German is a bit off) or perhaps just a heavy club.
If you'd consider giving the pike another attack direction while making it unable to block a huge nerf, you could just make pikes cheaper! That'd make good sense as well. It's meant as a support weapon and just look at it! It's a piece of wood with a point attached to it. Pikes ought to be cheap and accessible. Make them so affordable that you can easily bring a sidearm for when it gets too close and personal and give them a high stab so as to boost their versatility and usefulness. Oh, one last thing: you should be able to brace your pike! It worked just great in Deluge and it's as realistic as it gets. It wouldn't be OP and it'd be a great way of realistically countering enemy horsemen. Bracing your pike would make you vulnerable to missile weapons, sure, but you could protect valuable choke points from enemy horsemen and force them to dismount.
A thing about halfswording: People hardly ever use the secondary 2h mode. Why is that? Because it sucks. It offers no advantages at all. Why not buff halfswording a bit and make it work like it should? Using a 2h sword's secondary mode limits your reach and robs you of an attack direction so why not let it give you a few bonuses as well?
I've picked up Napoleonic Wars recently and I came across some rather interesting new and old animations that you could use for halfswording. You could either give the secondary mode a high stab so it'd still have 4 attack directions or you could implement the "Murder stroke" so your character could bash his opponent in with his pommel and deal blunt damage. When you use the rifle's secondary mode in NW you'll notice that they've added a new high attack and I think that one could be nice for a devastating murder stroke
A thing about shields: (This has been suggested before) Shields should only protect what they cover. If you are using a buckler (Shame on you!) it should only block those arrows actually hitting the buckler. In Vikingr (That mod had the best combat system ever) you could easily get around and enemy's shield as an archer because it only protected what it actually covered. Making shields work like this would make larger shields useful and it would give missile weapons a very realistic buff. The board shields are all but useless 'cause their strength (their immense size) is superflous. Smaller shields can generate force fields around you and make the the larger, and often weaker, shields all but obsolete. I've spent much time on my shielder alt and it always annoyed me how those cowardly AGI-whores seemingly were able to catch every single arrow coming at them with their small bucklers. Bucklers don't and aren't meant to work like that. Some months ago I joined a historical weapons combat group and I've trained some sword & buckler fighting and one of the first things you must learn is that the buckler isn't a shield. It is simply too small to work like a shield. Oh well, I got sidetracked but what I'm suggesting is to nerf some shields in a realistic way and make sure that the larger shields aren't simply forgotten. Having shields work like this would add an additional layer of depth to being a shielder as you couldn't just pick "the perfect shield" but would have to find your own perfect balance between protection and speed.