Oh man would I love to have a built in notepad window that saved! I'd make to do lists, lists of masters I still needed, quick things to copy and paste (URLs for example), notes about in game things (how many of fertilizer, water, and bones it takes for a power root), etc. Hugely useful idea. I wouldn't even mind if it was saved on your hard drive...you could add an 'export to desktop' button that saved stuff like friends lists, notes, etc to a file, and you could email it to another comp or transfer it on a USB drive.
While I'm talking about friends lists...please pretty please give us a way to import friends lists or share them between characters
As for the click to cure thing...I admit I rarely use it myself but that's because I'm an experienced raid healer. I find it much faster to simply use the F keys to target then click in one spot, rather than clicking in 6 different spots. But like I said there are a lot of newb healers out there that just don't cure like they should. I think if there's a satisfactory nonbloated way to include click to cure, it should be put in as a training tool. (Speaking of which I don't remember a tutorial popup explaining what a status effect was or the different ways it can go away. That's a kind of important oversight.)