I'm almost sure, I'm not the first one to ask, but I think an option to load ARM9 payloads (f.e. ReiNAND, Decrypt9, ...) via Brahma 2 would be pretty useful. Would only work on or below 9.2, of course.
CTR Boot Manager, for example, has this, and Brahma 2 is by now pretty easy to include as a library. Including it could be solved the same way the eshop patch is included in HBL v2.5 (via a .SMDH and a .XML).
Maybe that wouldn't even require a change in your source code, and I could simply add start parameters to my own Brahma2Loader (again, same as it is solved for the eshop patch).