Remove TP Waiving

- No, please dont, it gives us a reason to use the combos. One extra attack for free tp is great, and it is great that we have to earn it.
I think you only enhance my point when you state that. If there was no TP Waiving... why do combos at all? The Combo Effect.

Reduce TP Costs

- This has already been done pretty much, tp waiving is a great way to get more tp while also being able to use other skills.
As I said, TP waiving does something much different than simply reduce the TP costs. It gives you 3 weaponskills at the cost of 1. There is NO reason to simply do 1 > 2, when you can do 1 > 2 > 3. There is not mitigating factor in deciding that, as it is simply free damage. If you have a pool of 3,000 TP and, let's say 3 weapon skills each costing 500; 1000; and 2000. You could do 500 > 1000 and save your extra TP for a separate combo OR you could do 500 > 1000, build 500 TP along the way, and do 2000 at the end. The point being, there is no choice in the current system. You just do 1 > 2 > 3, and anything else is pointless. You can't simply use 3, as you can do 1 > 2 > 3, and even if you could do 2 > 3, there would be no point, as you can do 1 > 2 > 3. With my suggestion, you could do 2 > 3, or 1 > 3 or even more interesting things like 1 > 2 > 2 > 3, or 1 > 1 > 2 > 3.

Remove Positioning Requirements for Combos

- Nah, it is a part of the combo, if they remove it, it is like getting double damage without doing anything, then they could just remove tp and mana from the game instead
The weaponskills would still require positioning, but, as I stated, it would allow all roles access to all combos. They still lose the benefit of the enhanced damage from the weaponskills by not positioning themselves correctly though.

As a MRD DD, I only have one effective combo against a single target. Brutal Swing > Maim > Godsbane. I can keen flurry to do it again, but when Godsbane is down, I do Brutal Swing > Maim. And I'm saying, yes this is MUCH better than last patch, as previously I would only do 3k TP Maim and brutal swings from behind. But, just taking the changes to brutal swing, I would be moving regardless if they had added combos. So, it is actually just redundant to place them in both areas, unless it was specifically designed to limit the skills we would want to use, which IMO is counter productive.