Well let me answer both of them for you.
1. There's already a way to see what thread's you've started as seen here:
https://www.mpgh.net/forum/search.php?searchid=21566141
You can get to that page by going on your own profile and press "Latest Started Threads".
2. The reason that is implemented is so user's don't change their Skype's/thread details etc. in case of scam reports/rule-breaking purposes. So that's a safety shell to prevent that from happening.