Hi Gahan1990,
First of foremost I enjoyed playing that set with you earlier. You have a nice all round game and you will find plenty of decent members who are your standard
As for "etiquette" well in TS3 it was not allowed to take step towards the tram line from the default serving position - moving in towards the tee was fine. I am not sure if this has been set as a rule yet in TS4 but it will be if not at the moment. Send Moral Spain a private message if you have any questions - he is always good for that.
On the 2nd stick serve there is 100% no rule against that, neither was there in TS3. However I think I can read into your comment that you may think stick serving can be overpowered and more accurate and therefore it is a nice question. I think the answer is that it would be too hard to police or really know if you opponent was doing it. However members have talked about wishing the 2nd serve had less power in it (from a 2k point of view) because powering down 2 serves @ 150 mph is not that realistic, despite the fact that some pro's like Roddick may at times do it...
With regards to the World Tour there will be some good players on there no doubt, a good few will be from ITST too but for me the real competition is here on ITST. Members who play on this site are pretty dedicated and passionate to say the least when it comes to Topspin as you can imagine with all the forum posts!

There are players of lots of different levels, poor, average, good and beasts! All is fair play and you will see little if any or poor conduct in post match messages or slicing all matches or standing within the baseline or out wide serving etc. Its about as realistic as it gets
Also there are challenger tournaments and soon to be future tournaments so you can find your feet in those and avoid some of the big guns if you want match practice.
Hope that helps and hope to play you again soon...
Baggy
They call me Baggy...
TS3: No.1 MSS - retired (15 titles)
TS4: No.3 MS - retired (2 titles)