[R] editing a package directly from R

[Fredrik Lundgren]

Dear R,

I have made a package 'myfuncs' of some home made functions and 
installed it without problems. It contains no C or fortran code and no 
dynamic link library. Is there a way to edit this package directly from 
R (or Xemacs with ESS) or do I always have to edit the source and then 
reinstall the package? I have a weak memory that such editing could be 
done in S-Plus 2000 or 6.1?
Windows XP, R 2.0.1, Xemacs 21.4.13, and ESS 5.2.2

Thanks for any help

Fredrik Lundgren