Adding grapple mechanic would be fine, just like having dodge, ready, proper reactions and so on.
I have never seen a RPG with grapple mechanic.
Having to carry only one big item at a time and your hands are full then would be nice.
Temple of Elemental Evil had grapple, and I think the most (if not all?) of the 3.5's combat actions. It also cleverly used shared initiative for making clusters of enemies act simultaneously. I'd say that the way they implemented combat may have lacked in environmental interactions, but, as far as action selection went, it adopted all it could. It was very tedious (owing to the game being 90% combat) and awful to control, unfortunately. If someone's UIs truly were nightmarish, it was Troika's (R.I.P.).
