Define position at power-up for Z axis

Is there any way (I presume by editing the code) to make Marlin firmware power-up and assume a certain position of a motor?

I have been using the 1.1 RC6 version on my CoreXY machine and I've noticed when I first turn the machine on and do a home x and home y, it starts trying to move my Z axis down despite the z axis is already at the end of it's travel at the bottom. I've played around with the new options for the Z_RAISE_PROBE_DEPLOY_STOW and Z_RAISE_BETWEEN_PROBINGS, and they don't accept 0, and even changing the IF statements elsewhere, 0 doesn't work right with probing then. The machine is using the FIX_MOUNTED_PROBE definition as I'm using DC42's Differential IR sensor and don't need to deploy it.

What I have noticed, after I do an initial print (or maybe even an initial homing followed by a G1 Z160 and then M84), and then start another print, the LCD is flashing X Y and Z, but still shows Z as 160 and when it homes X and Y it does not even attempt to move Z. So this results in me wanting to have Marlin assume after an initial power-up make Z 160 (The maximum limit of my Z axis in Z_MAX_POS) so it won't attempt to move my Z any further lower causing it to jump teeth on the belt since my Z axis is a Gt2 pulley and belt.

Or would I just have to have G92 Z160 in my start code before I did a G28?

My knowledge is that when you power on the printer it assumes it's at 0,0,0
If your carriages are elsewhere, that's what it thinks are 0,0,0 until you home it

I think technically the workflow is to home it before you power it off, I don't do that.
I had the same type of problem until I changed this option

#define min_software_endstops true

I changed it to false and I could home without a problem.

Also make sure if you have EEPROM enabled to do M502 followed by M500

That's the part I want to change. When I power it on, I want to make it assume (0,0,160) instead of (0,0,0). When it assumes (0,0,0), it also assumes when I home X it needs to move Z away because of the probe, yet in reality my Z axis is 160mm away from the head and does not need to move to home X and Y.

It homes fine, but when I home X and Y it starts to try and move Z away, which is already at the end of it's travel. I supposed I could add Z-max limit switches, but there should be a way to define the assumed start. For now, I have a workaround in my start G-code, but that doesn't help when someone homes the machine from the LCD panel.

Workaround:

G92 Z160 ; define Z position
M84; make sure all the motors are off to force the Z axis to drop if its not at the bottom already
G28; Home the machine

Doing the above in my start code stops the Z axis from trying to move due to the Z probe settings, but that doesn't cover the case when someone homes the machine from the LCD menu which is why I asked if its possible to change the power-up position.