To hide the scroll bars, add the following line to the Preferences > Settings - User:

"overlay_scroll_bars": "enabled"

To make F5 refresh the sidebar’s directory view, add the following to Preferences > Key Bindings - User:

{ "keys": ["f5"], "command": "refresh_folder_list" }

To make Unix-style line endings the default (in case you’re in Windows but want to write shell scripts or something), add the following to Preferences > Settings - User:

"default_line_ending": "unix"