Planning Meditation Topics
One shouldn't practice that way if one is practicing Vipassana. The sole goal of Vipassana meditation is to be able to directly see the reality in front of you, so setting up other goals doesn't fit.

If one is having a persistent problem in meditation one can switch over to other techniques to deal with them however. For example, if a meditator keeps having angry thoughts towards people coming up in meditation practicing loving kindness meditation is an effective antidote.

Generally though if you are practicing Vipassana you should only apply these remedies as needed to overcome distractions instead of trying to work them out ahead of time.