I'm working on a Modpack for Vanilla game play and was looking for a way to have the Ping Display remove the Hwyla display when Tab is held.

I was trying out various Ping Display mods and located Server Tab Info [Curse Link] which seems to hide Hwyla when it's held even if you're looking at block. Wondering if this functionality could be incorporated info BPD?

This is a ridiculous bug report. You want the mod rendering the HUD to hide it, not another mod to hook into it and do it. Not only that but why would it be Better Ping Display's problem when the player list is displayed in vanilla as well? Last but not least, WTHIT (the current incarnation of Hwyla) actually has an option to hide that while the player list is displayed.