Unless this is done in single player only, there are a lot of technical challenges associated with this style of controlling the saber when making it work over the Internet as you have to deal with latency. The difference is already noticeable between SP and MP with the current saber system. Blocks and sabering in SP feel more solid and responsive, whereas MP feels kind of random and a bit flimsy; and this is with predetermined animations. If you allow the players to literally draw out the path of the saber, then lag will be a major downside to your idea and it will look quite bad if done poorly.