I would really love it if Evernote provided a way for me to map my own re-usable variables or aliases for a given notebook. So for example if I had something like:
$1991_Gryffindor_Seeker = Harry Potter
$1991_Gryffindor_Beater1 = Fred Weasley
Then, in any note where I type '$1991_Gryffindor_Seeker', it would automatically replace that text with 'Harry Potter'. Updating the value of the $1991_Gryffindor_Seeker variable on the mapping screen would then automatically replace the text in all notes containing that specific variable.