Hello,
Muse still facing problem to generate text-shadow CSS for fonts because of compatibility with ie7. If you put shadow on fonts (compatible with only system fonts) it will convert you font into image. Those images are not readable for "Search Engines like Google, Yahoo, Bing, etc." So Here is a solution, till muse come up with some awesome thing.
If you are aware of little bit of CSS. If you want to place text shadow on h1 or h2 or any paragraph style you created in muse. Open any page in muse. Go to page tab & navigate to "page properties". A new popup windows comes up with 2 tab "Layout & Metadata". go to Metadata & place CSS for your related tags.
For example If you want to place text shadow on all "h2 tags" along this page.
Then go to Metadata & type
<style>
h2{text-shadow:#fff 1px 1px};
</style>
It will create text shadow for all h2 tags along this page. Here #fff is color of shadow, 1px & 1px are distance for shadow from x -axis & y-axis. It is CSS3 code. You can go through with more details if you are CSS expert.
Thanks