Reported via email. Am marking as high-priority.

"""
It appears that version 4.0development.15 no longer loads any user
rulesets, at least in the form in which they worked in previous
versions.

I am aware that this is due to the change to an SQLite-based container
for the built-in rulesets. I did examine the source code enough to
determine that nothing currently calls the getCustomRuleDir() function
defined in HTTPSRules.js.
"""