hi
coming from a g9, been learning to use the g11 in canon housing for a couple of weeks now. best would be to shoot raw. i've also set my custom settings to
(without strobes)
c1: macro mode, mf @min distance, mid zoom, Av f8 iso80, flash on with diffuser (TTL) wb auto/flash (alternative would be Tv set at 1/250 or 1/500)
c2: full wide, Av f2.8 iso80, flash off, wb sunny - for ambient light wide shooting
with strobes i retain both custom settings but tend to be on manual mode more as you don't get TTL with the wp-dc34 anyways. changing settings & focus point can be a pain at times but you'll get the hang of it. though ISO is decent for a p&s, i wouldn't really reco going above 400 on the g11.
my other settings are as follows:
flexizone
servo af off
continous af off
af assist off
mf point zoom on
safety mf off
review focus check
IS shoot only
hth