1. You can't. Limits is set in client. even if you add in server, your server or client will crash. Same is max ehcnat, you can't go beyond 65535
2. Just increase in sourcecode and add new exp to each lvl. But again its have its own limits. If i remember correctly hi5 can have max 100 lvl
3. I need more info about this. Where to see? in chat or dialog box?