Giving WriteReg functions overwrite options

Would it be possible to expand the functionality of WriteRegStr and the other write to registry functions so that they have an option of only writing to the registry if the registry value you are writing to doesn't/does exist already.

I wrote a macro to do this, I was just wondering if there are plans to do something similar for the registry script functions.

There is no need to add this to the NSIS VM since it can be done using a simple macro.

Boo-urns, I shall stick with my macro then. Thanks.