seems to be missing "n" (next message in thread) support
if i can figure it out i'll submit a pull request, but i'm not an obj-c developer so i'm just throwing spaghetti at the wall so far.
Are you talking about keyboard navigation within the message (right-most) view? The next/prev message methods in Mail.app broke in Mavericks (even the drop-down menu options don't work), so it's possible the method is just broken. This is an unfortunately common occurrence with Mail.
Are you talking about keyboard navigation within the message (right-most) view?
Yes. I just discovered through trial and error that OPTION-UPARROW and OPTION-DOWNARROW are the default keys. Would like those to be replaced with "n" and "p" as Gmail does.