I´am not sure if it has been already discussed: in my opinion there shouldn´t be a difference between the behaviour of a posting and a comment concerning the use of the {ENTER}-Key.
In the comment-section, there should be a button [submit] and the {ENTER}-Key should start a new line. It´s really bad for the user to send the comment with {ENTER}.
Please remember to change the behavior of the comment-field in 4.2! There should be no difference between the postings (textarea with new lines) and the comments (until now an input with a single line and no new line).
By the way: I use resize: vertical for textarea an my visitors like it:
.ossn-wall-container textarea
resize: vertical;
Well about comments there should be way to add new lines in comments. We shall try to implement in v4.2
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