On the 07 coupe, 1LT, considering the footwell lights, mirror lights and hatchback lights, will any interior lights stay on if they were turned on manually before leaving the car?
The left knee push button turns the footwell lights and mirror lights on. Each mirror button turns the respective mirror light off/on leaving the footwell lights on.
After leaving and locking the car with the footwell lights turned on manually, will the footwell lights stay on until the battery dies?
The "Battery Run-Down Protection" section in the manual doesn't say if the footwell lights are automatically turned off as part of battery rundown protection. See below.

From the 07 owner manual, pages 170 - 171:

"Instrument Panel Brightness
The **** for this feature is located on the left side of the
instrument panel.
Push the **** in to turn on the interior lights.
Turn and hold the **** clockwise to brighten the
lights or counterclockwise to dim them. During
the day, this **** will adjust the instrument panel
brightness and at night will adjust all interior
lighting.
Be sure not to have this **** turned all the way
down with the lamps on during the day. Your
Driver Information Center (DIC) may not be visible.

Courtesy Lamps
When any door or the hatch/trunk lid is opened,
the interior lamps will go on unless it is bright
outside.
You can also turn the courtesy lamps on and off
by pressing the instrument panel brightness ****.

Entry/Exit Lighting
With entry lighting, the interior lamps will come on
when entering the vehicle. The interior lamps
will come on for about 20 seconds when the
engine is off.
You can turn exit and entry lighting off by quickly
turning the courtesy lamps on and off.

Reading Lamps
The inside rearview mirror includes two reading
lamps. The lamps will go on when a door is
opened. When the doors are closed, each lamp
can be turned on individually by pressing the
switch for that lamp.
An ambient light is located in the passenger sun
visor clip. This light stays on while driving to
keep the cabin from being too dark.

Battery Run-Down Protection
This vehicle has a feature to help prevent the
battery from being drained in case any of
the following lamps are left on; the underhood
lamp, if your vehicle has this feature, vanity mirror
lamps, cargo lamps, reading lamps, console or
glove box lamps. If any of these lamps are left on,
they will automatically time-out after about
20 minutes. To reset it, all of the above lamps
must be turned off or the ignition key on."

 

We've had reports here of the map lights not timing out after 20 minutes when they were turned on (usually inadvertently) by use of the dimmer switch at the left left side of the dash. I've not experienced it myself.