All-in-one thruster containing 50% fuel (or empty space?) and 50% thruster capable of outputting up to an absolute maximum of 50% (maybe 40% at the same fuel usage as 50%) of a Variable Thruster's maximum thrust, possibly less than that, with a minimum (and possibly sole) fuel usage equal to the VT's minimum. Does not draw fuel from other fuel modules (maybe). Does not decrease missile lifetime the way standard thrusters do. Has start delay, maximum burn time, and optionally maximum thrust sliders (no ramp time).
Yes I do want this solely for the purpose of creating semi-practical, variable-range, rocket propelled depth charges and flares