I don't know if people consider this a feature or not, but I find t1 engies bumping into eachother all the time pretty horrible. When making buildings the bottleneck usually isn't travel or build time, it's the time those bloody engies stand around bumping into eachother while trying to get in position.
I think the fundamental problem has always been that the avoidance steering behaviour on the units has a way too steep curve. It's nothing,nothing,nothing,BAM HUGE BUMPING FORCE. Having a bigger avoidance range with a gentler force slope would make everything an order of magnitude smoother I think. Unless there are of course some other technical aspects I am missing.
What do you think?