On startup, jug reads the file ~/.jug/configrc (if it exists). It expects an .ini format file. It can have the following fields:
[main]
jugdir=%(jugfile).jugdata
jugfile=jugfile.py
[status]
cache=off
[execute]
aggressive-unload=False
pdb=False
wait-cycle-time=12
nr-wait-cycles=150
These have the same meaning as the analogous command line options. If both are given, the command line takes priority.