This is not a huge factor in search engine rankings, but will help your users easily scan your content and find the keywords they are looking for. You should use bolding and bullet points to set apart words in the text, and this further tells the engines what is important on the page. Don’t go wild or you’ll end up cluttering up your page and aggravating the user.
In an integrated application/setup development environment, the original developer should modify the WiX source files in sync with the application development. As soon as a new module has been started, a new registry entry, service or other dependency has been coded, the appropriate setup modification should be made in parallel. Using this approach, no important information will ever be lost and, as a bonus, the setup program will be practically finished together with the application itself.