Currently when you long-press a comment the "comment options" dialog appears, just like when you tap it.
I am requesting to keep the "comment options" for a tap, but on long-press to show the text selection dialog (the one that appears when you long-press on a question or answer)
This would allow users to select text from comments, e.g. in order to paste terms in Google etc.
Update: Kasra Rahjerdi suggested in the comments that the copy functionality could be added in the pop-up menu instead. Do people consider this useful?