Not sure if anyone here can answer these questions, if not I'll ask in Slack.
1) Do I understand it correctly that it is possible to trade mosaics on exchanges as long as you get the exchange to list it? Just like any other coin/asset? But unlike Counterparty or NXT, there is no built-in decentralized asset exchange (yet, anyway).
2) Would it be possible to mass-distribute mosaic tokens? I'm guessing one would need to build a tool for this? It would be great if doing so was built into the wallet at some point.
3) Would it be possible to pay out mosaics on a regular basis automatically? Like a monthly salary, for example. Again, I'm guessing one would need to build this functionality. And again, I hope this will be built in eventually.
1) Yes
2) Need to build a tool for it and can be built into a wallet. You can fork that out from the nanowallet.
3) it is possible to pay out mosaics on a regular basis automatically, and yes, you will need to build that functionality. Building it into the wallet requires one to build that smart contract into the wallet and it depends on the rule.