Ladder challenge system questions

Hello

1- If you challenge someone but lost the match, can you challenge the same user again straight away? or you have to challenge someone else before?

2- What is the waiting time frame for someone to react when challenged (either accept or decline) before it counts as a forfeit and they swap spots?

3- Can I manually edit the positions of the users on the ladder?

4- number of challenges and declines is on a daily basis, right?

5- can I edit the email templates that are sent to users when an challenge occurs? are there any shortcodes for the variables used in such templates?

Thanks