that's horrible about the removing devices. with other zwave setups you can remove devices even if they break and you don't have an opportunity to remove them. all without having to manually setup the network again.
Well, in a way it is horrible, but it is also for a good reason (as far as I understand it). Each Z-wave device has a unique address with the Administrator device (be it a simple button with Administrative capabilities, a USB stick, or even an ACT ZCS201). If you yank out devices without telling the Administrator, you pollute the device list with addresses that have no device attached anymore.
BUT, I am not sure why it is not possible to tell an Administrator to free up a certain address, after a couple of warnings and "Do you REALLY want this?" popups. After all, sometimes devices do break down.