I think the main use case for pasting (and also copying) is the multiplayer chat, that's the only instance where I can remember missing it. Maybe level titles as well. The other minor nuisance is that you cannot move the text cursor, it's always at the end of the typing field. That's maybe a bigger issue than copying/pasting.
I guess these are the downsides of rolling your own custom code for these standard UI things...
I guess these are the downsides of rolling your own custom code for these standard UI things...