Scrolling

[Rich Heiberger]

It looks like you want to use one of the other options.
C-c M-b  (also C-c ESC b) runs ess-eval-buffer-and-go
This will place the cursor at the end of the evaluated section.

>From within myfile.s or myfile.r enter C-h b to get a list of
all bindings (key combinations) in effect in that buffer.
There are many options that begin with ess-eval-
If none of these is quite what you want, it is easy enough to design
another option and attach it to a key combination.

Rich