No the game is already the native resolution of your monitor. So you don't need a higher resolution. There isn't one since it's already your native resolution. You can't go higher then your native resolution.
Well by default the user interface is scaled to your native resolution but it keeps the same size no matter what resolution is set. I understand what you are asking for though. You don't want it to scale to your resolution so it will actually appear smaller and sharper without the scaling. To do that you have to edit your baldur.ini file which will be located in your "my documents" folder in the "baldur's gate enhanced edition" folder. You need to edit the " 'Graphics', 'Scale UI', '1', " line. Change the 1 to a 0 and that will disable the UI scaling which will make the UI graphics smaller and more sharp. If the line doesn't exist add it in just under the " INSERT INTO options ROWS ( " line. All of these example lines are without the quotes and you also might want to use notepad ++ to view the file because it will look pretty bad without it. Of course if you don't want to use notepad ++ you can just add the " 'Graphics', 'Scale UI', '0', " line right after the " INSERT INTO options ROWS ( " line just add two spaces and then insert the line. Hope that helps. If you need clarity I can try to simplify it further.
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Also my side bar seems blurry.