Steve is very good about things, in fact at a previous EVO, he had already signed my and a fellow EVO ers ibanezes, then walked over to us 5 minutes later asking "anything else you want signing guys ? Have I signed everything for you ?
the trick is, from my (2 EVOs) experience, is have everything ready for him, ie CD cases open (at the page of booklet you want signing, I asked him to sign top of CD disc), guitars out of case and ready, point out to him, whereabouts on it you want (i always go for back of headstock, so doesnt get rubbed off over time). , no wrappers / messing about. Line everything up for him to just walk by and sign as he goes, so 5 things takes about 10 seconds. He usually brings a black marker with him, so don't ask him to sign anything black ! it wont show up.
what is rude, is "dominating" his time. One guy at an EVO, got Steves attention, he walked over, and THEN the guy started rummaging in a backpack, unwrapping books, CDs etc, he had half a library in there. Steve was there a long while, which took away a good piece of time for everyone else.
I'd say about 2-3 things is Ok, any more is disrespectful to Steves time and other EVOers. If you abuse his goodwill, youre likely to get a tap on the shoulder from his Manager (at the time, a very nice, but tough looking giant called Mikey).
The guy is so professional,. he doesn't even sign over the serial number of your axe. http://imageshack.us/photo/my-images/687/1000491b.jpg/