I edited the transport buttons to all have the Mode "Control" except for Record and Loop, which I set to "Ctrl Toggle". All with Min LSB 000 and Max LSB 127.
I also set the following CC #'s for the transport commands, from another forum topic somewhere I think:
CC 50 = Phase nudge up
CC 51 = Stop
CC 52 = Global Record
CC 53 = Phase nudge down
CC 54 = Start
CC 55 = Loop On/Off
All I did once I tweaked the Keylab button settings was save it to Preset 00, then also to Preset 01 in case I want to do some extra experimenting.
Then, in Live, I just did the usual pull up the MIDI Mappings window, clicked on each button with the mouse and pressed the corresponding button, and they all worked. Saved that Current Set as Default, and voila: all new tracks have the mapping ready to go.
(I saw somewhere that I should set the Start control to Relative mode to prevent jittery double-tap starting, but Live kept setting ALL the transport controls to Relative and pissing off my Loop control, so I exited the MIDI map mode, then went back in, set Loop back to Absolute, exited, and Start & Loop and the rest all work fine)
And it's really damn easy to update the mappings as you open each of your existing sessions.
Sidenote: I REALLY don't use the nudge function in Live much as it's my home studio rig. I might try re-mapping those to the punch in/out functions.