Heh, while I was making this, Rob posted. This one will work too.
//------------------------------------------------------------------------
INVTACTIC NukeEmTilTheyGlow
//------------------------------------------------------------------------
DisplayName "Nuke Them Til They Glow"
Description "We'd better nuke the place from orbit, it's the only way to be sure..."
Tech_Requirement ""
Image "Tactics_Missiles"
Cost 1500
LuckFactor 0
PreRequirement 0
PreReqValue 0
BonusType 1
BonusValueMin 100
BonusValueMax 200
PlanetQualityPenaltyMin 95
PlanetQualityPenaltyMax 100
InfluencePenaltyMin 95
InfluencePenaltyMax 100
ImprovementPenaltyMin 95
ImprovementPenaltyMax 100
ENDINVTACTIC
Couple things:
a) Influence Penalty Min/Max do work. You'll get a 'String Not Found' message in the 'Results' screen, but the Influence is penalized, so I'd go ahead and use them if you like.

Tech Requirements do work, Mass Drivers is dependent on Warp Drive, for instance. It'd be trivial to go through and attach a Tech Requirement to the stock InvTactics.
I wrote an editing program that handles all the formatting for you, if you'd like to download it check it out at:
http://www.ctuit.com/bill/galciv.htm
Currently it allows you to edit all the plain text data files except for Improvements and English.str- so you can edit/add/delete Anomalies, Ships (just the data, not the models!), Events, UP Issues, Invasion Tactics, Political Parties, SB Modules, and Techs.
~SDC~
[Message Edited]