1, Slipstream is set to weak half out of habit and tradition from GT5 where real wasn't an option and half to give those slower drivers in a group a bit more of a fighting chance of keeping up. I've seen no reason to change so far but am beginning to look at this setting and perhaps adjusting it at a later date.
2, This race is restricted to the NA2-R, everyone is then in the same car and everything achieved is down to driver skill alone. Hence also the tuning being prohibited.
3, Racing team driver or casual gamer. Real life professional driver or Someone who's never driven a real car in their life. It doesn't really matter here. As long as you try to keep your racing clean.
If you like the sound of an event, say you would like in and if there's space I'll do my best to accommodate. Equally, if your plans change just let me know.
I try to keep it as casual as I can without it being a "track day".
4, No, there aren't any regular days. The dates in the calendar graphics are the only ones I stick to. Anything else is done as and when. Sometimes if there is enough call I might hold a practice session but anyone can post here and tout for company if they wanted.
On a personal note,
The reason for the slightly odd spacing of events is because I work shifts also and to keep the race days the same it plans out like it has.
I hope that answers everything.