Copying iTerm2 Profile Between Computers
On the first computer, go to Preferences. Tick "Load preferences from a custom folder or URL". Browse to where the folder should be saved (e.g. in Dropbox) - this should be its own folder (so create a folder called iTerm or something). On the second computer. Load this folder, then restart iTerm. Then the "Load preferences…" box can be unticked.
For Alt+Left etc., go to Preferences, Profiles, Keys, and load the preset "Natural Text Editing"