I would also be happy about 2 new features :)
Function 1: Make adminshop sale limitable above the config.

E.g.

Default false switch on a limitation

ADMINSHOP_SELL: true

Default 80000 Doller, indicates the limit in currency

ADMINSHOP_SELL_LIMIT: 80000

Default 24 H specify time in hours

ADMINSHOP_SELL_TIME: 24

This means that players can sell something in the adminshop but if they have already collected 80k from the adminshop you have to wait 24 hours to sell again.

Function 2:

Make the sign layout editable also via config

These ideas seem really close to #330 and #237 so please provide additional feedback there.