Is it fair to ask the DM for some kind of benefit if you give your character self-imposed weaknesses/downsides with definite consequences/mechanics behind them?
For example, if I had a character with the Half-Fae template (Fiend Folio) at +2 level adjustment, and I decided to look up some traditional fey weaknesses and worked them into gameplay mechanics, e.g.:
Aversion to Iron: Must avoid Iron objects normally, takes -1 penalty and unable to use template abilities (eg flight or spell-like abilities) if in contact with iron or cold iron, i.e. equipped with iron weapon/armor, bound with iron chains, etc;
Cannot lie: cannot use Bluff to outright lie, only tell partial truths or abuse exact words; cannot bluff to answer a question asked three consecutive times;
Cannot enter a building without invitation: self-explanatory; cannot physically enter a building unless someone inside invites them in;
Obsession with shiny objects: must make will save to resist bribery in GP or other objects with intrinsic value, DC proportional to value in GP of item(s) (but not 1:1; that would get out of hand fast).
Would it be too imbalanced to perhaps ask for a reduced level adjustment for the Half-Fae template provided I adhere to these strictures and roleplay them consistently? Would it be fair to ask for a benefit for this sort of thing at all? Is this min-maxing? Am I just going power-crazy here?