According to "The King Arthur Flour Baker's Companion", pg 230, freezing yeast doughs has no effect on the yeast UNLESS the freezer temperature is 0 degrees F or lower, typical home freezers generally do not get that cold.
In addition, pg 196 specifies that freezing is the BEST way to store instant yeast.
Yes you are right. I am so sorry I was answering another question at the time. Freezing slows down the action time of the yeast so increasing it by 10-15 % sent helps the proofing time of the bread and will also help give it full jump in the oven.