Is it possible to add a new fx for Mercury4Max?

I see that the fx functions are provided as Max patches in mercury_ide/patchers/. So it seems possible to use these as a template and add a new patcher. Is anything else needed?

My view is that the fx features are already good, but I also have some custom dsp interests to explore.
I also would like to have more options for reverb - not to replace the existing yafr2 solution but to add something with more options. I thought of some of the ABL objects in Max 9 - these have the advantage of a ready made dsp. I realize that it isn't good to do anything that would cause problems for users without Max 9. But adding something additional based on Max 9 seems different than replacing something. It could be noted in the docs as "requires Max 9" just like things like ratchet are clearly listed as Mercury4Max only.

(Note: this follows on discussion in Issue # 54 in Mercury-Playground.)