I don't use castor oil in any products. My hair really hates it. I also use natural soap bars, not shampoo bars.
The shampoo you listed has soap--"saponified" is the cold process way to make soap. Usually saponified olive oil is referred to as Castile Soap. This is just watered down with extra ingredients. You can try it; however, I don't think it's really different. Just watered down soap.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; DM MiraCurls Curling Gelly; UFD Curly Magic; Shescentit LIs; Sevi conditioners; Botanical Spirits Puree, CJ Repair Me