Do you mean the hold interval? 100 is very low — the default is 500, after all — but on most devices tapping quickly should still work. If not on the Iliad then perhaps we should consider a device-specific minimum of 200.
If you can't manage to reach the relevant menu then you can always delete or adjust the relevant setting from settings.reader.lua:
Code:
["ges_hold_interval"] = 100000,
Be sure to keep a backup of the file just in case.