I figured out had to compile glutin with alacrity. Below is the patch that I used in glutin to temporarily enable this feature. I'm not certain it is 100% behaving correctly. @jwilm any recommendations on how you would like this feature implemented?

diff --git a/src/api/cocoa/mod.rs b/src/api/cocoa/mod.rs
index 2282176..6eb0062 100644
--- a/src/api/cocoa/mod.rs
+++ b/src/api/cocoa/mod.rs
@@ -768,7 +768,7 @@ impl GlContext for Window {
 
     #[inline]
     fn swap_buffers(&self) -> Result<(), ContextError> {
-        unsafe { 
+        unsafe {
             let pool = NSAutoreleasePool::new(nil);
             self.context.flushBuffer();
             let _: () = msg_send![pool, release];
@@ -887,7 +887,12 @@ unsafe fn NSEventToEvent(window: &Window, nsevent: id) -> Option<Event> {
         },
         appkit::NSKeyDown => {
             let mut events = VecDeque::new();
-            let received_c_str = nsevent.characters().UTF8String();
+            let ev_mods = event_mods(nsevent);
+
+            let received_c_str = match ev_mods {
+                mods::ALT => nsevent.charactersIgnoringModifiers().UTF8String(),
+                _ => nsevent.characters().UTF8String(),
+            };
             let received_str = CStr::from_ptr(received_c_str);
             let received_str = from_utf8(received_str.to_bytes()).unwrap();
             for received_char in received_str.chars() {
@@ -895,7 +900,6 @@ unsafe fn NSEventToEvent(window: &Window, nsevent: id) -> Option<Event> {
             }
 
             let vkey =  event::vkeycode_to_element(NSEvent::keyCode(nsevent));
-            let ev_mods = event_mods(nsevent);
             events.push_back(Event::KeyboardInput(ElementState::Pressed, NSEvent::keyCode(nsevent) as u8, vkey, ev_mods, Some(received_str.to_owned())));
             let event = events.pop_front();
             window.delegate.state.pending_events.lock().unwrap().extend(events.into_iter());

Allow remapping modifier keys in the config #62

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