I know this particular topic is quite old, but I figured this would be the place to report this, as it is part of the same project.
I have been setting up my own TM .list file, and while doing this, I saw that MO 376 has not been extended to Route 76/Ozark Mountain Highroad on TM yet. MO 76 has been accounted for, and this task force was months quicker than MODOT themselves to make that change.
I would leave the MO265 waypoint as is, and change the current MO76 waypoint to 76CouBlvd_E, or just 76CouBlvd if the last waypoint is named MO76. On Route 76 itself, there isn't a 76CouBlvd_W, so you could leave the 76CouBlvd_E waypoint as-is or change its name to MO376.