Hello, for 1. you can try https://es.wordpress.org/plugins/buddypress-login-redirect/
2. Not right now as the theme uses wp-login, but you can customize wp-login with a plugin
3. If you mean the admin bar, at Theme Options you will see it at Misc
4. Add ithemes security plugin, https://wordpress.org/plugins/buddypress-nocaptcha-register-box/
Let me know if it works 🙂
Hi there!!! Help others from the community and mark any reply as solution if it solved your question. Mark as a solution