I just finished another modification of your plugin. This one adds new command "bibfilter". It displays small html form, where user can filter publications by author and publication type (command defines which types).
Example of use:
[bibfilter group=year group_order=desc author=Nahodil|Vítků menutypes=INCOLLECTION-In_Collection|MASTERSTHESIS-PhD/Diploma/Bachelor_Thesis sortauthors=0]
If you find this useful, I can push it to the repository and create new pull request. I was not sure if it does not disrupt the pending request, so I didn't push it yet.