QUOTE ("Runner's Companion @ p. 43")
The Karma system offers all the options available to the default Build Point system, while remaining integrated with in game Karma-based character improvement. Consequently, gamemasters may
choose to allow starting characters to use Karma for any and all purposes that they normally would in-game (to initiate, to join a technomancer guild, to quicken spells, etc.). The gamemaster should retain final judgement in the matter and should consider the ramifications of some advanced abilities this option might unlock at the start of play.
My personal ruling on this matter is "Sure, initiate at start. No higher than Rank 1 though."
Note, this is from the part "Tweaking", so it is an optional 'rule' by default.