Would you allow a Super-admin (one single person) with "full privileges", combined with "No user group (including any other admins) should be able to run arbitrary code" ?
I'd definitely prefer that it be impossible to run arbitrary code from the Web interface.
2) If you accept a detailed bid that includes an impressive, partially finished demo site, then is a BTC down payment of ~25 to 33% possible, to provide income while the project is finished?
If the code is available, I could pay by milestone. 25% seems like too much.