I'm sure it is doable... but it would probably require replacing the talent window. It may be possible to just resize it, but I wouldn't bet on it.
My advice would be to download the WoW UIDesigner program from here on WoWI and then use it's ability to browse the Blizzard code base to look at WoW's implementation of the talent window (the XML and Lua both) and then you should be able to figure out either how to resize it or replace it.
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