Normal user's participation is very important to testnet but hard to attract their participation due to technical and attentional budgets. So I suggest mirroring their activities based on SteemConnect.
- Steemit devs create a testnet account (e.g. steemtestnet)
- Users register the testnet account to their posting authority via SteemConnect
- The testnet account mirrors users' mainnet activities and collect error logs.
- Some bounty is desired