Long timeout-mine would be cool I think aswell. On my server, I'm sure I'd set it to very long
Yeah, in Quake Live the proxy mine lifetime is very long too and its huge fun

It wouldnt be problem on open-maps in Nexuiz either i think, but if closed maps get spammed with it... Maybe with high ammo usage it would work, like 5 rocket ammo for 1 mine.