At this time, the Code Assist doesn't include standard Oracle datatypes in this list. It will show existing objects and users - whatever is selected in the Code Insight 'Include' list, in the Toad Options | Editor | Code Assist screen.
If you want to speed up the entering of code, you can also try creating an Auto-Replace rule in View | Toad Options | Editor | Auto Replace, and add a new rule for example, in the Value column, type INT and in the 'Replace With' column type INTEGER, and it will auto-replace when you type it in the Editor.
