Yes, it is possible.
This is typically used in the optimizer area to allow specific fixes to be turned on or off as some fixes can have a significant effect on execution plans.
_FIX_CONTROL is a special hidden dynamic parameter introduced in 10.2.0.2 which accomplishes exactly this.
The syntax for using _FIX_CONTROL is:
“_fix_control”=’Bugno:ON’ (OR) “_fix_control”=”Bugno:1”
“_fix_control”=’Bugno:OFF’ (OR) “_fix_control”=”Bugno:0”
Source: MOS note 827984.1
Also check Tim Hall website for more info: