I use a MK-4902 too, its gotta be the most shitty feeling keyboard ever. Ive played casios that feel better than a 4902. I just use it cause its a cheap keyboard and easy to replace when i break em! Put it this way, when it comes to controllers, you get what you pay for, and you don't pay alot for an 4902, so i wouldn't recommend it.
Does that hellp?