I don't have access to my development machine (as of now), so this answer is purely a shot in dark.
I've not tried it though, i will once i get time.
So here goes, Create a Class (say BaseActivity) that extends Activity, and override the Options Menu Functions.....
Now, in the other 15-16 Activities, instead of extending an Activity, You should extend BaseActivity.
This way, all your activities derive the Options Menu...for Activities where you want the Options Menu Disabled, you can override it again in the Actual Activity...
Hopefully, it doesn't give you problems in the Manifest Files...
Hope it works, i'll try it soon and let you know... :)