OK OK. My thaughts were in using spears only for defense and swords for attack, without switching after charging, but that seems out of reach for the RTW-engine.

Most units described as "assault troops" in EB don't were spears. Taxeis Triballoi come to my mind, Agrianikoi Pelekephoroi, Thraikioi Peltastai. And I'm just a little upset because my shiny fancy elite über ass kicker royal imperial Hypaspistai use their swords only for parade duty, not for severing heads from their enemies. So I thought it would be nice if they use their spears for parade duty, like Thureophoroi, and then go attacking with their swords by ALT-click, which is a safe bet for no weapon-switching at all methinks.