For a really little bit of money on merge, id actually be aggressive with it if it's from freerolls. It's hard to get paid anyways since it takes a long time to get a check so i dont see a point in br mgmt from freerolls unless you give a challenge to yourself.
If your going to take the time to play freerolls(and earn some cash) why not worry about BRM. Its never a good strat to go for the golden ring so to speak. If you get lucky its all good but if ya dont then your back to square...
Failing to Prepare is Preparing to fail : John Wooden