I totally agree with the request. I work as an electrical engineer and I use OneNote so far which has formula editor integrated. Having discovered many nice features of Evernote, the lack of this feature is actually the only reason why I haven't already switched to Evernote. I definitely need this for my daily work. My preferred solution would be to enter formulas with a latex syntax. All workarounds with entering the formula somewhere else and posting an image in Evernote or handwriting the formula are really too cumbersome and cannot convince me to finally switch to Evernote.