sequencer_script_runner.py

import bpy

bl_info = {
    # modified version of zeffiis quick script runner, see https://gist.github.com/zeffii/2b488961226ee1ecefcf
    "name": "Sequencer Script Runner",
    "author": "Samoth",
    "version": (0, 1, 0),
    "blender": (2, 7, 6),
    "location": "Sequencer, Properties Panel (right)",
    "category": "Sequencer"
}


class GlobalScriptRunner(bpy.types.Operator):
    bl_idname = "sequencer.script_runner"
    bl_label = "Sequencer Script Runner"

    def execute(self, context):
        # or put own script here...
        textblock_name = context.scene.global_script_to_run
        textblock = bpy.data.texts.get(textblock_name)
        if textblock:
            textblock_as_string = textblock.as_string()
            exec(textblock_as_string)
            return {'FINISHED'}
        else:
            return {'CANCELLED'}


class ScriptRunnerPanel(bpy.types.Panel):
    """Creates a Panel in the Sequencer Properties Panel"""
    bl_label = "Script Runner"
    bl_idname = "SCENE_PT_script_runner"
    bl_space_type = 'SEQUENCE_EDITOR'
    bl_region_type = 'UI'

    def draw(self, context):
        layout = self.layout
        layout.label('Script to run from Shortcut')
        layout.prop_search(context.scene, "global_script_to_run",  bpy.data, "texts")


def register():
    bpy.types.Scene.global_script_to_run = bpy.props.StringProperty()
    bpy.utils.register_class(GlobalScriptRunner)
    bpy.utils.register_class(ScriptRunnerPanel)


def unregister():
    bpy.utils.unregister_class(GlobalScriptRunner)
    bpy.utils.unregister_class(ScriptRunnerPanel)
    del bpy.types.Scene.global_script_to_run