The WCA indicator is not a bad idea; the hard part is figuring out all the best places to put it. It would be easy enough to put it in a corner on the Weekly View and Manual Entry pages and in the Timer page. It's harder to figure out where to put it in the rankings.
The manual entry in the timer page is pretty clunky. I should really completely revamp it. It was the best I could do at the time to allow it to still mostly work from a phone as well as from a computer, but it's not very good. I'd like to try to make it better; I need to find the time to work on it. But it will probably be at least a few months before I can get to it.I'm not sure how hard this would be to fix, but there's a minor issue with manually entering times. It's the same in Chrome and Firefox: if I click away from the line for entering times, to enter a comment or DNF, +2, or to edit a time, the spot I need to click to get the cursor in the correct place again is a very narrow line above where the time is actually written.