46rh questions

So I’m currently in the process of freshen up a 46rh I recently acquired. I have a couple of questions on some things.
1- do the billet high dollar servo pistons/accumulators actually have any real benefit on a mild street application
2- what do the billet reverse/low servos actually help improve?
3- the rear sprag is it even worth touching for a mild engine
4-I read some people use a rod on the accumulator, what is it’s purpose and is it recommended?
5- the final thing here, what size transmission cooler should I run. I see jegs sells some nice ones with a fan built in.