I don't keg so can't comment on the pressure.
Half the priming sugar will work perfectly.
As far as negative effects leaving a 1/2 batch in the secondary for a week. The only one I can see (assuming you are good and sanitary which I'm sure we all are) is exposing the beer to oxygen. I never have done what you're describing and can't speak from experience, but I would be concerned about oxygen exposure potentially resulting in a beer that won't store as well. But if you drink it within a couple months of bottle I wouldn't expect a problem.
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Primary: None
Secondary: None
Bottled: None
Drinking: Schwarzbier, Raspberry Celebration, Northern English Brown, Carty Cascade Pale Ale - Vintage 2009, Maibock Pale Ale, 1120 IPA
Next: Simcoe IPA Bohemian Pils? Classic American Pils? Robust Porter? Dunkelweizen? Blonde Ale?
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