What value would I have to write to select any element in the drop down menu? I don't mind if I have to select it with an index or with its text value.
The method you want to use for your drop down list is ClickItem. For example,
PopupMenu is this UI control,
Is there a way to do that in a keyword test with the menu action operation?
Here's an example, which selects 'Audi' from the combo box using method ClickItem()
The following keyword operations,
MainMenu will select this,
PopupMenu will select this,