[R] Where would i put feature requests for a library?

[Jessica Streicher]

Hi!

If i found a problem with the code of one of the libraries (not core), or, in my current case, would wish something minor changed for convenience, where can i get contact? Can i put it in the "official" bug repository?

(Problem discription for anyone interested:
Why call the default function kpca for a matrix with kpar=list(sigma=0.2), instead of putting this default sigma into the rbfkernel and using kpar=list()? Anytime i call kpca with a kernel without sigma, i have to supply kpar=list() or get an error. 
)