Page ranges for last page or reverse page order.

[liujunwei4321]

1. I want to just merge only the last [two] page(s) of some PDFs, is it supported in page ranges such as Z, Last, End, r2-r1, keyword?

2. Sometimes I want to merge some PDFs in reverse page order, I input page ranges z-1, but not supported.

Or will you support it in the future?