1) This is on the todo list!
>>> that's good ;D
2) No new features are necessary for this, just put your object logic in a subevent like 'Is on screen', and all its logic will stop running when it goes offscreen
>>> that's awesome, didn't know about it for the logic part
3) Sounds like something best suited to a third party plugin - I think you can already get by fine with the built-in objects for this, but a third party plugin could help make this specific case a little easier.
>>> the reason i request this is to make it a bit faster and easier, sense i tried to do it before and i searched about in forum, hopefully we can see a useful dialogue plugin that won't breaking too much when exporting the game :)
anyway, thank you so much Ashley ;)