RD's no-illegal-mods policy does not extend to what you have on your system. RD may have its limits on what can and can't be used for our events, but by all means you can have the mod(s) installed on your computer if you want them. The only condition is that you do not upload the illegal mod(s) or share the links. As said earlier, it's more of a moral choice of your own rather than a requirement of being an RD member.