[TotalChaos SourcePawner]

Thanks again for the reply, backwards.

1. It's definitely equal to 0. Here's a small piece of code from the 2008 leak: "m_flMinSleepTime = 0;"
The float gets set to that under "void CTFGrenadePipebombProjectile::Spawn()".

2. As an answer to your question, neither.
I'm not running a dedicated server, but actually a listen server.
I run SourceMod on a listen server for my own private use/fun. This goes for other games besides TF2 as well, but that's not the point.
I am running the listen server on Windows 10, if that helps.

Edit: I commented out the "if (m_flMinSleepTime == 0)" part, and it still doesn't work.