Good morning,
I don't know if you are aware of how people work with TestComplete, there are some examples of how to work with a proper intellisense:
1) Example 1 Do not use TestComplete and ...
It works just fine so long as you remember you're writing scripts for testing automation and not as application level code. Classes and objects are supported in JavaScript in TestComplete to assist in building code, but generally speaking they are not required for automation to work. This is script code, not OOP code... think of it more of what you would find written in a web page and not so much what you would write in JavaBean.