diff --git a/powerline/core.py b/powerline/core.py
index 89b8b5de..6f4d5fe7 100644
--- a/powerline/core.py
+++ b/powerline/core.py
@@ -11,7 +11,7 @@ from powerline.lib import underscore_to_camelcase
 
 
 class Powerline(object):
-	def __init__(self, ext, renderer_module=None, segment_info=None):
+	def __init__(self, ext, renderer_module=None, segment_info=None, renderer_options={}):
 		config_home = os.environ.get('XDG_CONFIG_HOME', os.path.expanduser('~/.config'))
 		config_path = os.path.join(config_home, 'powerline')
 		plugin_path = os.path.join(os.path.realpath(os.path.dirname(__file__)), 'config_files')
@@ -51,8 +51,9 @@ class Powerline(object):
 		except ImportError as e:
 			sys.stderr.write('Error while importing renderer module: {0}\n'.format(e))
 			sys.exit(1)
-		self.renderer = Renderer(theme_config, local_themes, theme_kwargs,
-			term_24bit_colors=self.config.get('term_24bit_colors', False))
+		options = {'term_truecolor': self.config.get('term_24bit_colors', False)}
+		options.update(renderer_options)
+		self.renderer = Renderer(theme_config, local_themes, theme_kwargs, **options)
 
 	def add_local_theme(self, key, config):
 		'''Add local themes at runtime (e.g. during vim session).
diff --git a/powerline/renderer.py b/powerline/renderer.py
index 1b9e90e3..19f50d19 100644
--- a/powerline/renderer.py
+++ b/powerline/renderer.py
@@ -5,14 +5,11 @@ from powerline.theme import Theme
 
 
 class Renderer(object):
-
-	term_truecolor = False
-
-	def __init__(self, theme_config, local_themes, theme_kwargs, term_24bit_colors=False):
+	def __init__(self, theme_config, local_themes, theme_kwargs, **options):
+		self.__dict__.update(options)
 		self.theme = Theme(theme_config=theme_config, **theme_kwargs)
 		self.local_themes = local_themes
 		self.theme_kwargs = theme_kwargs
-		self.term_truecolor = term_24bit_colors
 
 	def add_local_theme(self, matcher, theme):
 		if matcher in self.local_themes:
diff --git a/powerline/renderers/shell.py b/powerline/renderers/shell.py
index 42023ef6..fe3d7a3c 100644
--- a/powerline/renderers/shell.py
+++ b/powerline/renderers/shell.py
@@ -8,6 +8,8 @@ class ShellRenderer(Renderer):
 	'''Powerline shell segment renderer.'''
 	escape_hl_start = ''
 	escape_hl_end = ''
+	term_truecolor = False
+	tmux_escape = False
 
 	def hlstyle(self, fg=None, bg=None, attr=None):
 		'''Highlight a segment.
@@ -45,7 +47,10 @@ class ShellRenderer(Renderer):
 					ansi += [3]
 				elif attr & ATTR_UNDERLINE:
 					ansi += [4]
-		return self.escape_hl_start + '[{0}m'.format(';'.join(str(attr) for attr in ansi)) + self.escape_hl_end
+		r = '\033[{0}m'.format(';'.join(str(attr) for attr in ansi))
+		if self.tmux_escape:
+			r = '\033Ptmux;' + r.replace('\033', '\033\033') + '\033\\'
+		return self.escape_hl_start + r + self.escape_hl_end
 
 	@staticmethod
 	def escape(string):
diff --git a/scripts/powerline b/scripts/powerline
index fb2d4bc1..acdcf577 100755
--- a/scripts/powerline
+++ b/scripts/powerline
@@ -3,6 +3,7 @@
 '''Powerline prompt and statusline script.'''
 import argparse
 import sys
+import json
 
 try:
 	from powerline.core import Powerline
@@ -11,6 +12,16 @@ except ImportError:
 	sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 	from powerline.core import Powerline  # NOQA
 
+def oval(s):
+	if '=' not in s:
+		raise TypeError('Option must look like option=json_value')
+	if s[0] == '_':
+		raise ValueError('Option names must not start with `_\'')
+	idx = s.index('=')
+	o = s[:idx]
+	val = json.loads(s[idx+1:])
+	return (o, val)
+
 parser = argparse.ArgumentParser(description=__doc__)
 parser.add_argument('ext', nargs=1)
 parser.add_argument('side', nargs='?', choices=('left', 'right'))
@@ -18,10 +29,11 @@ parser.add_argument('-r', '--renderer_module', metavar='MODULE', type=str)
 parser.add_argument('-w', '--width', type=int)
 parser.add_argument('--last_exit_code', metavar='INT', type=int)
 parser.add_argument('--last_pipe_status', metavar='LIST', default='', type=lambda s: [int(status) for status in s.split()])
+parser.add_argument('-o', '--renderer_option', nargs='*', metavar='OPTION=VALUE', type=oval)
 
 if __name__ == '__main__':
 	args = parser.parse_args()
-	powerline = Powerline(ext=args.ext[0], renderer_module=args.renderer_module, segment_info=args)
+	powerline = Powerline(ext=args.ext[0], renderer_module=args.renderer_module, segment_info=args, renderer_options=dict(args.renderer_option or {}))
 	rendered = powerline.renderer.render(width=args.width, side=args.side)
 	try:
 		sys.stdout.write(rendered)