I think you can do this now with a script.
This script will “focus beam down”. You can modify it to “focus beam up” by replacing next sibling row with prev sibling row.
tell front document of application "Bike"
if exists focused row then
set each to next sibling row of focused row
repeat while each ≠ missing value
if name of each ≠ "" then
set focused row to each
return
else
set each to next sibling row of each
end if
end repeat
end if
beep
end tell