You can disable it, but only if it has a switch to turn off and on, you just need to rig up a simple module to wire into the switch that will give the impression of a button push at start up, I have done this on 1 of my smart cars that has the feature ( I hate it and I dont think it saves any fuel at all )
Here is the unit I made
https://www.evilution.co.uk/mod/mhd-...f-at-start.htm