Star- i've played around a bit with hitpoints myself, and my guess would be if its not working it needs to be server and client side, however if you changed the files while the server was running you need to restart the server, that could also be it.
The speed mod seems to need to be both server and client side, although i havn't tested if will work as a simple server side mod. I made it on client side for my brother and i to play over lan, and we have another computer behind us set up as a lan server. The speeds worked when only on client side, but the cahnges in the weapon_equip file needed to be on the server... although it could also have been that i simply needed to restart the server.
Thanks for the info about the shaking
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By the way, my next mod is going to be an ELITE mod for those of you who'd like the game to be more challenging, in single player, and multiplayer. And one of my goals is to make battleships and gunboats dynamically generated throughout single player and multiplayer. I hearsay its been done before so hopefully with the help of some people on here it can be accomplished.
Thanks for your support.