I wouldn’t look for dreamhost to add this one click install. In general, the one click library at dreamhost is pretty forgotten. Wordpress stays up to date, but the rest of them are often MANY versions behind, and rarely do new ones get added.
Dive in. Installations are usually pretty easy to do and don’t take too much time. Caveat: If the instructions you are following have you unzipping locally (on your computer) and then uploading files and folders, don’t proceed as instructed, come back here with a link to those instructions and we’ll help figure out how to download the distribution file directly to the server and then unzip or untar it on the dreamhost server. Doing it that way saves hours and is less prone to errors.
Once you do this once or twice you come to realize there aren’t too many more clicks to install your own.