Sure, it's always a good idea to periodically practice basic skills like simulated out-of-gas emergencies and gas sharing ascents. The trouble is that many divers never learned these skills properly in the first place (or have forgotten) and if they try to practice on their own, they end up creating bad habits or even putting themselves in danger. If you are unsure of your skills, then taking a GUE
Fundamentals course is a great option; the instructor will take you through it step by step and then help you practice in a safe environment.
The exact ascent rate in terms of feet or meters per minute is not super important in a real recreational diving (within NDL) emergency. The important thing is to keep the team together and make a crisp, controlled ascent to the surface. Not too fast to cause a lung overexpansion injury and not too slow to run the donor out of gas. No bouncing up and down.
As others have pointed out, it's obviously better to avoid running out of gas in the first place. So, on the priority scale it's more important to focus on proper gas planning and management. But even if you do everything right, it's still possible to end up out of gas (or without access to the gas you do have) due to equipment failure. Or another diver who just happens to be nearby might come to you for help. Be prepared for that instead of thinking that it will never happen.