Override feature.store/ ifeaturebuffer.insertfeature OR other way of storing feature

[AbhijeetKulkarni]

Hi all,
is there any way I can add and store features to my existing featureclass other than IFeature.Store() OR IFeatureBuffer::InsertFeature?

OR Is there any way to override these methods?

I am using C#.net.

[KirkKuykendall]

IFeatureClassWrite.WriteFeature.

You might also consider using a cursor and set IFeatureClassLoad.LoadOnlyMode

[AbhijeetKulkarni]

Thank you Kirk.
My basic reason for asking this is, When I use feature.store OR ifeaturebuffer.insertfeature and add circle/ellipse in GCS, the area is different for input geometry and stored feature.