There's a ton of stuff in the executable. I haven't really looked at the UI xml files, so I'll leave that to someone else. Here's a few things I was able to dig out. Any of them make sense to anybody for either the UI and/or the config files?
uselightapi
vGPSPositionToRoad
background
night
btn_settings_nav_overspeed_incity
txt_settings_nav_overspeed_1
txt_settings_nav_overspeed_2
txt_settings_nav_overspeed_3
txt_settings_nav_overspeed_4
txt_settings_nav_overspeed_5
direction_id
direction_icon
exit_id
exit_icon
secondary_direction_id
secondary_direction_icon
secondary_exit_id
secondary_exit_icon
current_speed
current_speed_limit
near_speed_limit
current_altitude
turn_restriction_icon
destination_angle
has_route
has_waypoint_in_route
has_navigable_path
calculation_todo
has_laneinfo
car_heading
car_pos_valid
car_on_planned_route
speedlimit_warning
speedlimit_warning_voice
speedlimit_warning_visual
speedwarn_toltype
speedwarn_alt_toltype
speedwarn_tolerance
speedwarn_alt_limit
speedwarn_alt_builtup_based
speedwarn_alt_tolerance
autoreplan
autoreplan_action
show_countrychange
time_to_destination
time_to_destination_int
eta_at_destination
distance_to_destination
time_to_waypoint
eta_at_waypoint
distance_to_waypoint
time_to_manuver
distance_to_manuver
secondary_time_to_manuver
secondary_distance_to_manuver_total
secondary_distance_to_manuver_diff
maneuver_is_near
secondary_near_to_primary
secondary_manuver_is_near
next_street
next_street_enc
current_street
current_street_enc
destination_name_long
destination_name_short
next_viapoint_name_long
next_viapoint_name_short
refresh_time_and_dist
maneuver_near_threshold
second_maneuver_near_threshold
maneuver_distance_diff_threshold
show_original_signpost
position_valid
available
connection_status
latitude_str
longitude_str
speed
real_speed
heading
elevation
accuracy
rotation
dop
arrow_mode
arrow_overlap_offset
bg_mode
bg_add_left
bg_add_right
max_signpost_width
max_signpost_count
div_mode
max_lanes
min_lanes
empty_lane_mode
only_at_maneuver
skip_opposite
connectivity_mode
connectivity_distance
signpost_bottom_padding
signpost_arrow_padding
signpost_top_padding
signpost_left_padding
signpost_right_padding
signpost_word_padding
signpost_line_padding
signpost_max_lines
arrow_sel
signpost_bg
signpost_border
signpost_fade
signpost_pictograms
valid_var
pointer
triangle
angle_range
angle_offset
speed_range_km
speed_range_mph
limit_range_mode
limit_range_max_km
limit_range_max_mph
limit_range_from
limit_range_to
limit_range_angle_by_vertex
limit_range_bg
vAdvlist_SelectedItemPos
vAdvlist_SelectedItemUID
vAdvlist_PrevEnable
vSafemode
vQuickMasterVol
nOsVolume
vQuickMasterVolMax
bSyncToGPSTime
gps_state_log
zoomfactor
file_busy
attach_linear_compass
swid_info
pda_auto_start
disclamer_closed
memory_low
dynamic_volume_type
dynamic_volume_minspeed
dynamic_volume_maxspeed
dynamic_volume_voicemaxspeed
dynamic_volume_voice_volume_max
dynamic_volume_os_volume_max
dynamic_volume_autocalc_maxvoicespeed
current_time
current_date
blink
fast_blink
current_background
use_separated_safety_in_mainview
nightmode
near_cursor
menu_animation
memory_low_bound
memory_check_interval
vDefaultPoiSearchDistance
nCurPoiItemID
cursorpos
countryname
posinfotext
geocoord
lefthousenumber
righthousenumber
carviewpresets
carviewpresetsave
carviewpresetreset
show_tmc_config
show_gps_config
show_orientation
pedestrian_warning
pedestrian_warning_threshold
vFactoryResetPossible
drive_carefully
st_XMLLegalScreen
TmcStatus
vGpsStatus
vDriveCarefully
vFactoryResetPossible
cb_forceQVGA
sc_mute_off
sc_mute_on
current_station_name
current_station_name_short
current_station_frequency
current_station_message
station_tuned
auto_tuning
signal_strength
auto_tuning_available
change_tuning_mode
tuner_step_up
tuner_step_down
tuner_search_up
tuner_search_down
selected_source
selected_port
selected_baud
active_trip
tripcomputer
trip_name
trip_paused
speed_total_avg
speed_driving_avg
speed_max
time_total
time_driving
time_stopped
distance_total
max_acceleration
min_elevation
max_elevation
start_date
start_time
prev_trip
next_trip
pause_current
reset_current