Bacnka - its hard to say as we dont really know the full extent of your speech inpediment, if its something you can work on, and if you can speak sentences by adding 'erm' - you should be ok, but maybe itd be an idea to speek to an aviation medical specialist.
744FO - good post, youre a hell of a lot smarter and informed than i was when i was 19! youll go far me thinks