When we added on a little over a year ago, we were on the wait list for 75 points. While we were waiting, we were ROFR'd on two much larger VGC contracts and we started thinking we wanted more direct when we would finally get to the top of the list.
I called my guide and he said he could either just change the 75 to a higher number, and we'd keep our place on the list, or he could leave the 75 request alone and do another one which w/b at the bottom, for the additional points. We did that since we figured having two smaller contracts w/b good and it also spread out the payment a little.
So we were on the list twice at one time.
BTW, when we did both requests, our guide suggested, and we did this, that we specify a range of points we wanted. I think the first was actually 50-75; the second was 75 to 125. He said that way our names would come up if a smaller number of points became available instead of being passed over while we waited for the larger number.
He also told us, both times, that while it is easy to take a lower number than what you request since they just move those points to the next person on the wait list, it was harder, but not impossible, to get MORE points than you had requested. I actually spoke to a supervisor and she confirmed that was true.
I don't know for sure because we took the max each time, but maybe you CAN get more than you requested if you contact your guide. Or, it seems you could make your request for more points before your name hits the top of the list.
Although at this point, after waiting a year and having a resale in process, he might not want to draw any more attention from Disney!