Actually I do have a good reason why it should added. The Registry is a good place to store values for a script, and it beats storing values in a hash table, ini file, or variable.
Why is it better? Because it is less secure? Because it is slower? Give a reason why it is better rather than just saying it is better.
You may also want to change current registry settings via an mIRC script for some reason.
For "some reason"? Well give us a reason, if you want to say that is a use for it, give us an example, don't simply say that someone may want to use it, give us an example of where it would be used in this fashion.