Hi frmg,
sorry to hear that you don't like new version. Unfortunately features you are mentioning (prevent USB debugging, force connection) is not possible to do without root. And since root support is not planned (at least for now), we are unable to bring back this functionality.
Regarding to SIM detection - now it's working automatically. When you insert new SIM, phone locks itself, then you unblock it with PIN and since then SIM card is whitelisted.
About incompatibilities with web interface - what do you mean exactly?