I'm developing TW tool that's lack few feature

I made it for a customer two years ago where he ca add multiple accounts (using TW API), upload tweets (from text file ) and scheduler tweets with time gap , and that's it .
BTW I develop it using PHP and to work on web hosting (not from laptop etc) ,but few months ago I tweak it to work on SQLite so no MySQL db needed , I may think port it to windows app .
so what you think of such script is it suitable for IM or should I add more features ,