Hello and sorry for the delay!
Is it possible to have the old notification area display all icons in a single horizontal row, as the new one does, or is this a limitation of the old notification area?
All icons should be drawn in the same line but it's not possible to include these icons into the dock (the dock receives all icons, it's not possible to customise it and it's a problem with a wave/zoom feature of most dock's views).
Is there some way to change the sizing of the bubble for the old notification area so that the icons don't get cut off?
Strange! Do you have this problem if you move the main icon to the middle and to the left of your screen?