OK I'll try and answer your questions:
1) I am not sure on your model and territory if runflats are standard. My guess is they are. You can tell for sure by checking if you have a spare tyre or tyre weld (if not you will have runflats). There is also a runflat marking or comment on the side of the tyre normally. Or get the tyre model and search on the web to check if its a runflat.
2) I attach a link to Wikipedia which explains powder coating and a link to the guy that did my wheels also.
Basically powder coating means they attach the wheel to ground (negative) and charge the paint powder positive (via a special gun). With application of heat the paint powder is attracted to the wheel and melts to form a coating.
Powder coating produces a thicker, harder and hence more resilient finish than the alternative which is spraying with wet paint (like they spray car bodies).
As wheels are close to the road they are prone to scratches, stone chips and kerbing hence stronger paint via powder coating is better than wet painting.
Lacquer is simply the clear coating which is applied after the coloured powder coat. This is used to seal and protect the base colour coat and also makes the finish nice and shiny. It is a bit like varnish.
If you have plastic centre covers (like I do on my wheels) they cant be powder coated as I guess you cant apply a charge to them as they dont conduct electricity. Hence my centre covers were sprayed with wet paint - they still match the main wheel well. This shouldnt be an issue as it is less likely you would scratch the wheel centre than the rim.
In UK as a guideline it is normally around GBP50 (about €60) per wheel to get this done including repairing any minor kerb damage. To do this they should TIG weld the damage as it is stronger (again look in Wikipedia for definition of TIG welding if not sure). Some places just use car body filler which is not good as it isnt as strong......
Hope this helps. Cheers.
Powder coating - Wikipedia, the free encyclopedia J P Polishing Essex Alloy Wheel Refurbishment 
