Emoji support in email subject lines
Emojis are not a documented supported feature in Marketo, and while they aren't for every audience there are a lot of promising test results that show they can be effective at helping emails stand out.
Many benefits to using emojis are outlined in this Marketo blog post:
blog.marketo.com/2015/05/marketers-rejoice-emoji-marketing-is-here.html
It would be great to have this as a supported feature. Other ESPs have recently introduced support for emojis and initial test results and it's something I would like to be able to test out in Marketo. Vote this up if you feel the same.