The buildin thermistor tables are in Extruder.cpp.
The problem with your glass plate is the z endstop. You can not go below that endstop, hence it has to be the lowest point, which is without glass plate.
A possible solution could be this. You have a extruder position next to the glass plate, so you can down to the endstop without hiting the plate. Then you execute the following commands:
G28 Z0
G1 Z3 ; height of plaate
G92 Z0
@isathome
now your extruder is at plate height and the host and firmware assume this as level 0. You have to watch, that you don't call G28 after that. It would crash the extruder into the glass plate.
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