The default RAM value is stored in NVRAM (Non-volitile random access memory). The behavior is such that it avoids any unwanted or unexpected copying of resources (fonts, symbols, formsets, etc.) to flash or hard disk.
The download target setting only takes effect when changing to RAM from either FLASH or DISK to copy resources, e.g., fonts, symbols, formsets, macros etc.
A special product request would be required to change this default behavior.