Please add Spell Checking for identifiers and literals as you type. Allow using Custom Dictionary and adding words to custom dictionary.
I believe this can be done quite easy using ASpell like in Notepad++. Not really he coolest feature but will improve the the quality of the end software since usually there is one type at every 5000 symbols.
And formatting text as you type, e.g. changing itemindex to ItemIndex (capitilization) or Idnex to Index (common mistyping). Though you can already do this with GExperts.