That's a good question :-) I'm fine with adding ILs but we should discuss additional rules or exceptions due to Mecc and Delphi missions not being "proper" IL run compatible:

• Good RNG in previous mission, for example getting mines early in M1-5 can affect time of the next mission;
• There are 3 missions that carry over stuff from previous ones: --- M2-5 will start exactly where M2-4 ended, if loaded from menu the player starts back at Timmy's dad's house; --- Portals built in D2-1 used to quickly finish D2-3; --- more smarties will spawn closer to the base in D5-2 when it's done in a single sitting with D5-1. --- ...and there's the unpatched retail version (1.0) which doesn't remove already placed mines after finishing a mission
• There's a short time between a finished mission/loading screen and a cutscene when input buffering is possible;
• If I recall correctly PS2 version doesn't replenish ammo every mission like PC version.

I was thinking about timing M2-4 and M2-5 etc. as a single mission and disallowing input buffering, since that one can be unpredictable. What do you think?