As long as you are the host everything should work but some hacks will be applied to your party members also. Some HFS still work without being the host even some stamina requirements. It's a bit weird because if you aren't the host sprinting starts decreasing your stamina but using Evie's Blink skill doesn't even though both have been changed in the same HFS file (Not in the same script file that is located in that HFS file though).