Hi,
If I am reading your OP correctly, you were only a chargeable person (ie a person required to file a Form 11) by virtue of your share options. If that is the case and these were not an issue in 2010, then Form 12 is the correct form for you.
However as you are already aware, you can't do a Form 12 on ROS, you'll need to do it the old fashioned way.
Bearing in mind what Tommy said above, if you are happy that yours is a straightforward case then Revenue generally are very helpful and diligent in these cases.