Absolutely. This will be included in the next version. It was on my list of things to do, but kind of got pushed to the back at some point. It should be easy enough, as you say.
Just for your information, you should be able to use any other TTS engine that is installed on your OS by selecting it in options on the general tab. There is a pull down at the bottom right.
Currently however, there is no way to change engines "on the fly".
If you don't see this in your options you may be using an older version.