asterisk users - Jun 2011 - Easier to remember transfer and pick-up key sequences

I'm thinking of implementing some easier to remember key sequences in 
features.conf. Something like:

pickupexten = ##
atxfer => **


Can anybody think why this might be a bad idea, compared to the defaults 
*8 and *2? I have made sure that no other feature uses single * or #, to 
avoid matching the wrong feature.

Thanks,

Sebastian