Spidertron now can be damaged by car impact, and some collision-mask filtered attacks. You need to load this mod before placing any of spidertrons in game, otherwise it will be broken. For unmodded-vanilla scenarios, there is "damageable_spider_leg.lua" file in zipfile for used as lua module.
This mod dynamically adjusts the research speed and productivity based on the current count of online players. It allows to slow down or even stop the research in case none or only a few players are online.