jwoike,
i'm not familiar with your charger but there are a number of options that most chargers share. most will have a timer cut off, a cell voltage cut off and a total mah cutoff. If you're charging one 5300 mah pack then the mah cutoff could be set to 5000 or 5300 and it would keep your pack from being overcharged. you could also set the per cell voltage cut off at 4.2 and that would help prevent bad packs from having any one cell overcharged which is a fire risk. if you wanted to calculate the charge rates, the likely drained condition of the packs, the mah to be added, etc. you could figure a good charge time limit to set as well. this could also be set after you've seen what your typical useage produces in the way of charge times.
if you are charging multiple packs together in parallel, the mah cut off needs to reflect the multiple of packs you're charging (e.g 5000 for one pack, 10,000 for two packs, etc.)
the charging stuff can be really confusing but once you get a handle on it it's like everything else and becomes routine. just don't charge batteries on a combustible surface like a hardwood floor, fires are not as common as they used to be but they still happen. if you're going to experience a fire it will probably happen when you're learning how to use your charger or when charging a battery that has been damaged. fast charging without simultaneous balancing is also dangerous.
good luck with it.
bart