Keywords: unused, cut content.
Only because they didn't have time to out it in, it was always supposed to be in there and the scenes and dialogues themselevs exist, and as i said they approve and endorse the resotraiton mod.
About Sith spells? Of course.
Not just spells there are even examples of tk being charged up for example, e.g. when bane destroyed the temple in his battle with kas'im. fact is you can just speculate they anything we see from a force user could have been being charged up unless its directly stated otherwise. At the end of the day we have to agree to just tske it for what we see them do. All we see exar do is walk into the room and freeze everyone, and nothing states that he had to prepare it.
Yoda and Sidious never move at such speeds; by your reckoning, TPM!Obi-Wan must be faster. Or, more likely, Lucas was offering us a mere glimpse into how quickly Jedi typically maneuver.
Its not that they are faster its that force speed like that clearly only works in long straight lines, and they dont have the control of precision to do it in small scale.
Of course it does, the one I provided: Lucas is limited in time, budget, and artistic constraints. The novels, comics, and animated series don't have quite as many limitations. Hence why we see common troopers hold their own against Sith Lords like Darth Malgus in The Old Republic videos despite the fact that, as a high level Sith Lord, Malgus should move at speeds vastly superior to what we see. Or in the original trilogy, where Vader and Obi-Wan move like octogenarians with severe hip dysplasia. Such limitations must be taken into account when supplement material support the idea that they are much more formidable than otherwise depicted.
But money or tech is not an issue it really doesn't take much to show what youred escribing and fact si that we do see it in some parts. lucas simply chose not to include it in the mace palps duel.