Hi @Springer,
I think this is a complex WikiText project. I try to partially improve APA titlecase, but having wikitext to do all the job is absolutely time-consuming and tedious.
What is my own experience?
Actually, I do not manually enter bibliography data. I always get them from Mendeley, Google Scholar and Scopus. When exporting, I use the APA style. In simple words, I just try to store them in correct format. I know there is a big pitfall here: what if I want to use them in other style?
There was some discussion previously on Bibliography style in Refnotes. It seems a better solution is to use one of the existing JS libraries for styling bibliography. I will add reference to those discussion and library later on.
By the way I welcome any volunteer work on adding wikitext solution or JS solution to Refnotes.
See BibTeX and APA style with more flexibility - #4 by Zheng_Bangyou