I'd say CPerl mode is, to some extent, entitled to move this statement on a separate line, if only as a hint that you might revisit your code.

I don't think it's useful but it's not worth arguing about.

Without that strange scrolling (which I still fail to reproduce)

With emacs -Q I got the scrolling every time the error message was produced. It is a huge nuisance to deal with this scrolling.

Since the message is also an indicator that syntax highlighting and indentation will not work correctly until the closing delimiter is found, I'd hesitate to just suppress it.

That is absolutely ridiculous. Pressing the "m" key or the "s" key should not cause an error message to appear, especially not because of the extremely faint possibility that the user actually wants to start their regex with 

m
}

I don't know of any other language mode in Emacs, or even another instance in cperl-mode, where an unfinished statement of any kind, like a /* in c-mode or an open quote " without its closing quote causes an error message to appear. This unwanted error message is a truly exasperating nuisance.

In reply to Re^6: How would you indent this? by no longer just digit
in thread How would you indent this? by no longer just digit

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