Plus if we really wanted to block ASI mods, we would have just not offered the configuration whitelist.
It's really more convenient than if we indiscriminately loaded all ASIs; players are now able to remove mods that may crash them, or otherwise conflict with VC:MP, such as the widescreen fix remake that messes with FOV settings and causes bullets to appear not to hit you.
Tools like the 2012 Trainer can't be added to the whitelist for the sole reason that they are not ASIs. CLEO mods, however, can still be loaded in by whitelisting CLEO.