So what's it gonna take to get this running with Synergy?

I’m going to take an completely uneducated guess and say it shouldn’t be TOO hard, right? Since it’s all Source and stuff.

nearly all npcs have code and behavior that is completely non-existent in hl2, aswell as inputs and entities exclusive to bms.

so this will never happen.

the levels and graphics though should work flawlessly

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.