On computers, there is not really such a thing as a QWERTY keyboard. Your key mappings are all OS interpreted <default>. The underlying mapping of a binary value is interpreted by the OS. While there is a language symbol on the keyboard for your convenience, the OS does not see the value. That is why you can use control characters and symbols on your keyboard - because it is all 'abstracted' to binary values. So if the qwerty representation of an 'F' is under the left hand forefinger, but the DVORAK 'F' is where the QWERTY 'Y' would be, the OS interprets the physical binary into the resulting letter value. The application is a consumer of the OS interpretation...which is why this lack of support is odd. Because this issue suggests that the application bypasses the OS input management system...
From an application development standpoint, you can use the input management system of the OS or you can choose to intercept that input yourself. It would Make little sense (imo) to intercept those values manually if you were intending to support more than 1 keyboard 'abstract' layout. ie, the US-QWERTY keyboard is only one of many, and that is great if you only intend to support 1 US-centric English keyboard only. But for a product and business that likely wants consumption in more than 1 country, it would make much better sense to leverage the OS mappings and only program to the exceptions of new language supported keyboards or non-conformant key mappings. With this approach the product will natively support multi-lingual multi-national keyboard mappings with minimal exceptions. otherwise every language or mapping supported would require a hard-coding for each one to be supported, which would just be silly.
Of course, I could be missing something. Evernote is a quality product and I'm sure there is a reason for the decisions made on keyboard mappings. Just be aware that at an OS level, the QWERTY and DVORAK mappings are the same from an application point of view, unless the application is bypassing the OS input management system to interpret the keystrokes hard-coded assuming QWERTY is the intended keyboard.
as I understand it.