To customize a QUI menu entry there are potentially four resources that have to be changed. These are:
labelString resource that defines the text shown. 
mnemonic resource that defines the single character
abbreviation and underlining for the menu entry. 
accelerator resource that binds a key combination to the
entry. 
acceleratorText resource that sets the displayed
characters to show the accelerator. 
For example, the Frame Up entry in the debugger Travel menu is defined by the following resources
qui*debugger*frame_up.labelString:  Frame Up
     qui*debugger*travelmenu*frame_up.mnemonic:  U
     U as the mnemonic for the Frame Up
menu entry in the QUI debugger. This character will be shown
underlined in the menu.
     qui*debugger*travelmenu*frame_up.accelerator: Ctrl<Key>U
     qui*debugger*travelmenu*frame_up.acceleratorText: Ctrl + U