I complained about the same thing a few weeks back and there is a way to paste from the clipboard into the wallet client, it's just very cumbersome and does not conform to the Windows standard. You have to left click on the tiny program icon in the upper left corner of the command window to open a drop-down menu, then select Edit, then select Paste.

Obviously, you need to copy the relevant data into the clipboard first (address, password, whatever).

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In other news, I just checked the official pool and see the hashrate is above 700MH/s and that a Baikal Giant N now only makes 0.5 DERO per day. Lol.