I think it's neither bug nor feature... but should remain as is.
$inpaste as added after $ctrlenter, so it's not a bug for sure.
I feel It should remain the same because scripts that process On Input may treat pasted lines that begin with / improperly if $ctrlenter were $false. (possibly executing it as a command instead). This 'bug' also gives you the added bonus of telling if the person is pasting via Ctrl+V or RightClick-Paste (or Shift+Ins even)
- Raccoon