Hi, Phil.
I hope to implement a new model in this package what the new nominal response model for response styles in typical performance measurement of in this article. But I have not any knowledge for implement it. (I was suggested implement of the GGUM but I have not any knowledge for implement that a long time ago.)
Falk, C.F., & Cai, L. (2016). A flexible full-information approach to the modeling of response styles.
Psychological Methods, 21(3), 328-347.
Always thanks for your contribution.
Seongho