Option to always add server-only files as "both"
Many files marked as (logical) server-only are also applicable on the client, for singleplayer. This is partially a limitation of Modrinth's current side system, which doesn't distinguish between physical server-only and logical server-only, but also a choice for the modpack developer: is a logical-server mod useful in singleplayer? is the modpack only concerned with multiplayer so logical-server mods are not necessary on the client?
Client-only as "both" doesn't really make sense, since a mod that only does client logic shouldn't be installed on the server in most cases, and can cause crashes with mods that don't don't disable themselves properly on the dedicated server.