Is it possible to use the rms package to model multinomials logits, or elsewise to model several binary logits to achieve the same effect? I am aware that there are many other packages specifically designed to fit multinomial logits, but I am quite attached to the suite in rms.
The answer is no. Having delved into this myself, it appears that it is not possible at the moment. However, it could be accomplished in the future were someone smarter than me to put some effort into it.