Do you have a mode named "not away"? If so you can certainly set it to the mode "not away" in RM4:
If you don't have a mode that's named "not away" but you just want to set the mode to something other than Away, you will have to specify which mode you want it to change to. You can't just say "change the mode to something other than away." How would RM4 know what to change it to? You'll need to provide some kind of logic to help RM4 pick the right mode. This is how Mode Manager works as well.
If you provide a little more info, or maybe a screen shot of your Mode Manager, I'm sure there are plenty here who would help you set it up in RM4. But if it's working in Mode Manager, why change?