Being a CFI is all about learning, and applying, judgement and decision making skills. It's a seasoning process to instruct a while...a confidence builder. Doing instrument instruction and gaining experience in the IFR system would be a huge benefit, as well.

These things will do very little to help you get through RJ initial but will do a lot to make you a well rounded pilot down the road. What's sad is the quest to be a well rounded, experienced, pilot often falls to the wayside in favor of the quest to get on the list ASAP.