lol i like it Bacardi.... but as you may have noticed, games that are meant to show you being evil (besides Conker) usually dont sell well. And thats why all the KOTORs have been released so far, FOR MONAY$$$$$$$$. So it would not make logical sense to sell a game focused on Dark Side.
As well, did you notice that the end of KOTOR 1 had the Sith taking over the Galaxy?! Never in any of the other Star Wars stuff I have ever seen this happen next to the birth of the Galactic Empire. So it makes much more sense to just introduce a threat, kill the threat, rebuild, and it will seem like nothing happened and therefore you will not need to change any later games.
(An example of this would be if you chose to poison the KOLTO on Manaan, this would have repercussions travelling through all of history, and it might not make sense later on since the Star Wars Movies have already been made and they take place what 2000 years after KOTOR.)
Therefore canonical will always be lightside, unless you make a story about someone who has already been mentioned as darkside ( Exar Kun)