*** Scheme mode indentation now uses many of the facilities of Lisp
mode; therefore, the variables to customize it are the variables used
for Lisp mode which have names starting with `lisp-'. The variables
with names starting with `scheme-' which used to do this no longer
have any effect.
If you want to use different indentation for Scheme and Lisp, this is still possible, but now you must do it by adding a hook to scheme-mode-hook, which could work by setting the `lisp-' indentation variables as buffer-local variables.