Yes, you can have as many submit buttons as you want to.
<%= f.button :submit, "Send", :name => "send" %>
<%= f.button :submit, "Do another thing", :name => "do_another_thing" %>
<%= f.button :submit, "Do some other thing", :name => "do_some_other_thing" %>
It's pretty much the same way as Rails:
<%= f.submit, "Send", :name => "send" %>
<%= f.submit, "Do another thing", :name => "do_another_thing" %>
You have to name the buttons because the action (unless it's html5) will be the same, so you need to know which button was pressed in your controller.