Deadzone and the analog settings shouldn't affect positional data, as far as I know. The mouse cursor should snap to wherever it's pointed. Please correct me if I'm wrong, but lag in this case would be due to the latency between the Sinden gun, software, and display. Lag would also explain the inability to target quickly moving targets.
I bet we'll eventually get one of the YouTube channels with a technical setup like My Life in Gaming, Digital Foundry, or RetroRGB to do a full breakdown. It would not surprise me to see a decent amount of lag in this system.
I've also watched two videos demonstrating the gun encountering full crashes, where the gun just randomly stopped working. Hopefully, the software quirks will be ironed out soon. I'm not sure that all the people expecting their guns in November are willing to be beta testers.