Yes. You can have some buttons appear on the lower set of softkeys.
You would make a change to the 46xxsettings.txt file to force them to appear on the lower set of softkeys.
The section you would modify is below:
########################## Features on Softkeys #######################
##
## Idle Feature Settings
## A list of feature identifiers for softkey features
## available in the Idle call state
## 0 to 255 ASCII characters: zero to six whole numbers
## separated by commas without any intervening spaces
##
## SET IDLEFEATURES ""
##
## Dial Feature Settings
## A list of feature identifiers for softkey features
## available in the Dialing call state
## 0 to 255 ASCII characters :zero to five whole numbers separated
## by commas without any intervening spaces
##
## SET DIALFEATURES ""
##
## Ring Back Feature Settings
##
## A list of feature identifiers for softkey features
## available in the Active with far end ringback call state
## 0 to 255 ASCII characters :zero to three whole numbers
## separated by commas without any intervening spaces
##
## SET RINGBKFEATURES ""
##
## Talk Feature Settings
##
## A list of feature identifiers for softkey features
## available in the Active with talk path call state
## 0 to 255 ASCII characters :zero to three whole numbers
## separated by commas without any intervening spaces
##
## SET TALKFEATURES ""
##
The features are listed by code. You'll find them in this book starting on page 113.
Carpe dialem! (Seize the line!)