This is currently not a feature on srcom. RT and IGT are used universally for the whole board. That means that if I was to change it to IGT then that would affect Full-game categories, which currently take priority over ILs. Sorry.
I wouldn't mind having all the RT times removed. Not too many people run the IL's so I don't think anyone would really care if their RT's were deleted. Plus having a consistent timer to keep track of it without worrying about splitting correctly at the beginning or end would help a lot, especially for levels like Nepal where you can only push the IGT down to 5:19 while RT is wildly inconsistent.
RT times on the IL boards are pointless considering the run is timed by IGT as well, it's either redundant or really inconsistent like with ZwarKS blizzard world run, the real time is set as the whole video when that information isn't necessary
We can't remove the RT comparison altogether because of how speedrun.com works, but I think mods have the power to delete every RT in each IL. It would be tedious but probably the most fair for anyone competing there.
With Overwatch 2 finally going live, this means that our Overwatch 1 leaderboards are all pretty much legacied. All new speedruns should now be submitted to the Overwatch 2 leaderboards, here: