Does the Simplicity Studio™o IDE support more keyboard shortcuts than those that appear on a few of the drop-down lists from the main menu bar (File, Edit, Source, Refactor, etc.)?
Yes, there are a considerable number of keyboard shortcuts and time saving tricks that can increase your efficiency when developing with the Simplicity Studio IDE.
The Simplicity IDE implements the Eclipse development platform, and in particular uses the Eclipse CDT plugin (https://eclipse.org/cdt/) to support most of the C/C++ editor content. Since these are widely adopted open-source tools, you can often find answers to IDE questions/issues (including keyboard shortcut availability) using an online search engine. Due to the dependence on CDT, the standard eclipse documentation (and related web search results) may not be correct for all aspects of the Studio editor, so searching for "CDT Eclipse" together is advised.
However, the Simplicity Studio built-in help will be your most direct (and most correct) source of information. A good starting point is the [Tips and Tricks...] entry under [Help] on the main menu bar in the Studio IDE perspective. This opens the built-in help to the Tips and Tricks page that describes a number of features of the IDE, and includes multiple keyboard shortcuts.
For even more direct access to a concise list of keyboard shortcuts, select [Key Assist...] under [Help] on the main menu bar (or hit CTRL+SHIFT+L). This will open a scrollable pop-up list of keyboard shortcuts near the bottom right of the editor.
While in the IDE, some keyboard shortcut examples include: