Error Detection

Like in the 1.4.6 version when you type:
print("hello")
it turns they 'hello' red indicating its correct. I suggest having it so that if you forget to include say a bracket or = it turns the line red
meaning theres a problem in the line somewhere while your editing it.

That's entirely Lua code and not beyond your reach at all.

It's possible, a lua IDE is a project I plan to work on at some point, but I am sure there are others in the forum who will achieve it before I do.