Had this same conversation with several people about why we don't have this feature, can't be too hard to implement, or am I missing something?

It used to be there and have no idea why the removed it.

I think it was replaced b/c it was often used by mistake. I know it's not as simple but can't you copy the names the original PM was sent to and just paste them into the relevant box?

Yes and No

You can, but have to rearrange them into a list.

Indeed. Like I say it's not ideal but it's pretty straightforward. If it's regularly an issue you might want to consider PMing admin to request it in case he doesn't see this thread.

It used to be the default - which was annoying.

Would be nice to have the choice...

I can see why it was removed as the default option, but to remove it entirely is overkill.

Maybe we should raise it with Admin.

Alternative option would be able to make email groups.