As you can see, there is not much to ask about YaRPNcalc 
I was actually thinking about adding financial functions but failed on the numer of variables involved. My HP48 uses a dedicated equation solver to do those calculations, with 5 variables involved. Since I can only show 2 values on the stack, you would be left in the dark as to what the other 3 were. Even if you could see all of the 5 on the stack, you would have to know their order. I also thought about implementing a special input mask for it (as the HP does), but that would be a whole new concept in YaRPNcalc with a lot of work involved.
To make a long story short: I will probably only add this if enough people ask for it.
(That's a question I was asking myself ;-)
I got rid of the forum since it was almost never used. You can still send me an email should you have any question or comment about YaRPNcalc.