Hey Simo,
welcome to FC, I'm sorry no one got here sooner.
Let me see if I can help you with some of those questions perhaps.
-Temp control is soled separately at you local hardware store (or cheaper on ebay) in the form of a variable voltage power supply.
-it's really hard to combust with a log-vape ime, I've never been able to do so myself anyway. Of course this will depend on how high you turn up your voltage and also perhaps on what kind of stem you are using, but it's not something I'd worry about if I were you.
-you can turn it on just before use if you want to, although some of the logs will develop some play in the fit of the parts from heating up and cooling down all the time. Not sure if that's the case with the WW or not so I'm leaving this one open to J.R.R. It'll take roughly ten to 30 minutes before it'll be at proper operating temp so you better turn it on in time if that's the way you want to use it. If you get a variable voltage power supply you could just turn it down to 9V in between bowls as well if you want to to keep it a bit more ready to go and shorten heat up time.
-The WW comes with a GonG bowl that fits in a 14mm female ground glass joint.
-I've never had a lot of success with my WW tbh. It's pretty easy to get vapor with it, but I found it hard to get the ABV the color I want to be with the WW I must admit. I blame this mostly to the stems it comes with though, & not to the vape itself. Not everyone seems to share that experience though, so I'll leave this one open too. I would say it's easy to use up to a certain point, for me it gets harder as the end of the bowl nears.
-I don't believe you can take it apart to clean (someone correct if I'm wrong please), but in essence the vape won't get real dirty unless you are a very messy user perhaps. You can swap the needed parts with ISO anyway, I'm just not sure if the screen could be pushed out for thorough cleaning too. Anyone?
-I'm a firm believer that stirring helps you get the most out of your herbs with almost any vape including this one, but the opinions on that seem to vary a bit.
-I have no idea where Cookie is at with his redisgned core at this moment, so I'll have to refer you to management for that one.
-yes, well, in the sense that drawspeed will effect the vaporizing temperature with most vapes anyway. The faster air moves the quicker it cools down, & the slower you let it move through your herbs the hotter it'll get. Up to a certain extend of course.
I hope this helps a bit, good luck with your research