Hi,
Maybe will be good If you reformulate your question again 
like:
"In IC an agent wants to send a email with an image into the body, is there any possibility to attach a the image directly from the clipboard instead of uploading from a local file?"
Unfortunately I can not help you with this 
Regards,
Luis
PD: I don't think SCN-Forum and CRM Web UI can be comparables, but anyway, you can not paste a image in all the input fileds avaliable in the SCN-Forum, you only can paste it in the message context.