Port management with error recovery

[Jookia]

Hey there,

I've been toying with FreeBSD in a VM. I have a few questions on how to manage
ports:

By default you can't build multiple ports at a time. This makes it difficult for
updating the tree or doing bulk installs. Portsmaster and Poudriere seem to fix
this. However neither of them support keeping work directories and resuming
builds to reduce compile times on failures and updates.

What port management solutions could solve this? Am I doing it wrong?

Jookia.