I'll check the guild window, but I recall the list in the events tab scrolling fine for me. Note that the list of events in the main tab doesn't scroll as it's only a list of the most recent.
As for the Buy Quantity button, some items aren't stackable in inventory and thus you can only buy one of them at a time. For those items, if you try setting a quantity higher than 1 it'll disabled the ability to buy until you set a legal quantity. IIRC the same thing happens with stackable items if you try setting a quantity greater than a single stack, the game only allows you to buy one stack at a time. This behavior isn't controlled by the UI XML, so there's nothing that can be done about it. You can spot the maximum quantity in parentheses beside the top Buy button's label.
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