So you're saying if you use extended insert in the
NVDA+control+f command it works but not numpad
Does numpad insert work for other NVDA commands?
If not, the two likely options are that you have numlock
turned on, or that you perhaps in NVDA's keyboard settings
have unchecked to use "numpad insert as an NVDA modifier
key". You can get to those settings by pressing
NVDA+control+k or NVDA+n then choose preferences then keyboard
settings (using whichever NVDA modifier key is working).
In terms of not saving settings, NVDA has a checkbox "Save
settings on exit" in its general settings (NVDA+control+g or
NVDA+n then preferences then general). As long as that is
set, the current settings should be saved when you exit NVDA.
If you don't exit NVDA but rather shut the computer down, they
should still be saved as long as you do shut the computer down
and don't just hold the power button down or pull the power
cord out etc.
If you don't have that setting enabled, you can manually
save settings from the NVDA menu.