How do you cash in crawlers in multiplayer? Is PBEM completely different from TCP/IP? I've never done PBEM, but in TCP/IP you can't cash crawlers. You just have to disband them, which makes you lose half the minerals. You also start with a lot more units than you would normally, and I don't see any way to change that in the settings.
Hmm... That'll probably work... I'm just used to it popping up the screen as soon as you enter the city, so I never realized that pressing 'O' (or right-clickicking and going to action/convoy resources) made the same screen pop up that asks if you want to help the project.
Just to clarify Fitz's post: typing O will work in both tcp/ip and pbem (and single player). It's unnecessary in pbem and single player games, as they behave identically w/r to this feature. Typing O is only necessary in tcp/ip (and probably in the other simultaneous connection options -- I've never tried those).
So, don't disband your crawlers: that wastes their value. Hit O instead.