--- a/tools/tryselect/mach_commands.py
+++ b/tools/tryselect/mach_commands.py
@@ -6,16 +6,17 @@ from __future__ import absolute_import, 
 
 import argparse
 import os
 import sys
 
 from mach.decorators import (
     CommandProvider,
     Command,
+    SettingsProvider,
     SubCommand,
 )
 
 from mozbuild.base import BuildEnvironmentNotFoundException, MachCommandBase
 
 CONFIG_ENVIRONMENT_NOT_FOUND = '''
 No config environment detected. This means we are unable to properly
 detect test files in the specified paths or tags. Please run:
@@ -39,16 +40,29 @@ def fuzzy_parser():
 
 def generic_parser():
     from tryselect.cli import BaseTryParser
     parser = BaseTryParser()
     parser.add_argument('argv', nargs=argparse.REMAINDER)
     return parser
 
 
+@SettingsProvider
+class TryConfig(object):
+
+    @classmethod
+    def config_settings(cls):
+        from mach.registrar import Registrar
+
+        desc = "The default selector to use when running `mach try` without a subcommand."
+        choices = Registrar.command_handlers['try'].subcommand_handlers.keys()
+
+        return [('try.default', 'string', desc, 'syntax', {'choices': choices})]
+
+
 @CommandProvider
 class TrySelect(MachCommandBase):
 
     @Command('try',
              category='ci',
              description='Push selected tasks to the try server',
              parser=generic_parser)
     def try_default(self, argv, **kwargs):
@@ -65,17 +79,17 @@ class TrySelect(MachCommandBase):
         """
         from tryselect import preset
         if kwargs['list_presets']:
             preset.list_presets()
             return
 
         # We do special handling of presets here so that `./mach try --preset foo`
         # works no matter what subcommand 'foo' was saved with.
-        sub = 'syntax'
+        sub = self._mach_context.settings['try']['default']
         if kwargs['preset']:
             _, section = preset.load(kwargs['preset'])
             sub = 'syntax' if section == 'try' else section
 
         return self._mach_context.commands.dispatch(
             'try', subcommand=sub, context=self._mach_context, argv=argv, **kwargs)
 
     @SubCommand('try',