This hand came up in a congress swiss teams event on the weekend. North has been playing for decades (probably at least five) and has quite a lot of masterpoints, but wouldn't be considered an expert player. South is a bit less experienced. North-South's team finished about mid-field out of 60 teams which is probably a fair indication of their skill level.
The 2♠ opening was duly alerted by East and South immediately asked about it when it wasn't his turn, was politely picked up on this point by East and then North asked about it and doubled. 3♠ was not alerted or enquired about, but South went into the tank for about 30 seconds over it and then passed.
I'm happy to hear alternative views, but I don't believe 3♠ is alertable under Australia regulations. If relevant, the EW convention case says 2♠:3♠ is "to play" but is silent as to whether this is modified after 2♠ is doubled. A simple raise of a weak two being "to play" is a fairly standard treatment in Australia.
The TD was called by West prior to the final pass to get the BIT acknowledged and the contract went on to make 10 tricks. The TD was called back at the end of the hand and East-West contended that North had logical alternatives of pass and double so sought an adjustment to either 3♠W-3 or 3NTS-1 or some weighting thereof.
How do you rule?