Lighting control by means of moving entities or runtime intensity changes is an important design option missing from Q2.
This makes lighting effects more flexible. Scripted lights are those that do not move, and having them handled client side automatically cuts down network traffic. Dynamic lights that move contribute to network traffic anyway, because of the movement. Dynamics lights with properly chose position and falloff could be attached to moving trains and plats w/o creating artifacts. Muzzle flashes are essentially a temporary entity made of a zero size sprite and a light level and color.
Adds to network traffic, minimal with delta compression in the absence of changes.
Requires rewrite of entity handling with respect to lighting effects on the client. I propose adding to q_shared.h::entity_state_t
Muzzle flashes are one example of temporary entities as light sources.
This is complements the "Darklights In Scripting" proposal, which would expose negative intensity to scripting. It incorporates the proposal on extended use of dynamic lighting by Nathan Silvers.
Submitted 980411, revised 980420, revised 980508, comments to email@example.com.