CONVERSATIONS SIGNATURES AND SPAM WEEDOUT

I love the new conversations feature and how convenient it makes everything to be able to do it all from one app. I would like to be able to add saved signatures like we have on outlook when we respond to a message though so that way I can just click the pre-saved signature or Emily can if it is her responding so that way the email response looks professional and the customer knows who they are talking with. The conversations folder is also moving all of the spam/promotional emails into the conversations box and it is making it harder to see which emails are from actual customers/ suppliers and which ones are just promotions or spam. I am unsure if there is a way to rectify that part but if there is, that would help a great deal.