110 (1) Subject to this section and any regulations under section 168 [election regulations], a local government may, by bylaw, permit voting to be done by mail ballot and, in relation to this, may permit elector registration to be done in conjunction with this voting.
(2) For a municipality, the only electors who may be permitted to vote by mail ballot are
(a) persons who have a physical disability, illness or injury that affects their ability to vote at another voting opportunity, and
(b) persons who expect to be absent from the municipality on general voting day and at the times of all advance voting opportunities.BC Local Government.
... the keyword seems to be "may".