The Half-Life mod that could have been it all but unfortunately never made it. Half-Life Elite to me was what us Opposing Force players where waiting for, it was essentially AG for the OP4 player. Our good friend Santagauss and many other op4 players were involved in the development of this mod.
I hope if anyone ever reads this they could try and convert this to an AMXMODX plugin, like AG or Severians Mod. Russia seems to be doing some fantastic developments of the last 10 years.
The interface and the options that were available with the mod were like non other and yet where never discovered. One comment that I must make is that the bunny hopping was so smooth, unlike anything else, smoother than the original and smoother than the Russian HL Bug Fix DLL.
I would happily set up a server for this mod as an ode to my good friend Santagauss if there was ever demand for it. It really is worth just checking out.
One of my favourite things about HLE is that it introduced client side settings through a tidy little interface, for example you could use random coloured Gauss sprites, I know this seems ridiculous but each player would have different colours and depending on what team you were on, you would use that colour. The simple joys in life 🙂