I did some tidying up today and came up with the following set of Search Aliases:
a - author (built-in column)
c - #current_status (custom column of text type, with a fixed set of values: Reading, (to) Reread, DNF, Read)
d - date (built-in column)
f - #formats (custom column using template {:'re(approximate_formats(), ',', ', ')'} )
fv - #fav (custom column yes/no for favorite titles, triggers a star emblem in cover grid)
i - identifiers (built-in column)
l - languages (built-in column)
lv - #last_viewed (custom column set by Job Spy plugin)
m - last_modified (built-in column)
p - publisher (built-in column)
pd - pubdate (built-in column)
r - rating (built-in column)
rr - #grrating (custom column from Goodreads plugin)
s - series (built-in column)
t - title (built-in column)
tg - tags (built-in column)
Very happy with this new setup.