I guess you could use the cron daemon and friends to put the task into the background (so that it will be halted) and bring it back to life when needed

It all depends upon what system you use (I don't know if it is possible to suspend a process in Windows)

cron (not to be confused with tron), bg, fg, and kill

C:\>oclvanitygen.exe -D 0:0 -D 0:1 -D 0:2 -D 0:3 -D 0:4 -D 0:5 1prefix

That's for 6 cards

Sorry for my noobness like me... how does one import keys? And is there a way to make the search caps-insensitive? Thank you

I didn't know the noscan-option exists. "Noscan" would be okay if you import the address before depositing to the address, or if you want to import several addresses and scan them all at once afterwards (rescan 86 GB can take longer than creating the address).

It would be great if this also works with a "pruned" Blockchain, so you can still import vanity addresses without downloading the entire blockchain again.

Any idea what the exact command would be? I've tried several options (noscan, norescan, rescan=0, rescan=false), but it instantly says "Rescan is disabled in pruned mode". I don't want to rescan, I just want to import the address.
Someone posted the same idea on Github 2 weeks ago. I guess it's not possible yet.

In a way importing vanity addresses is the same as importing from cold storage. It has been tested on Reddit. Conclusion: It should be possible to get the balance without downloading the full blockchain again, but it's not (yet?) implemented.

Edit: I'm confused: somehow it did add a watch only address, but it says it requires a rescan to show the balance. I haven't been able to import the private key though.
Now I get what you meant! I did "importaddress 1something rescan false". It imports the address without rescan, and "rescan" is the label of the address. So I should import it useing "importaddress 1something Something false" to give it a more useful label.

I lost my wallet dat but I still remember my bitcoin Address, can I recover it using vanity?

Help please.

 Not in a million years with a million GPUs.  Sorry for your loss.

Can GPU's only be used for the oclvanitygen?  I can't figure out how to turn my GPU's on for vanitygen64.exe?

You can't. If that would be possible, anybody could "recover" any Bitcoin address.
You may be able to recover your wallet.dat file, depending on how you lost it and how much you're willing to try (or pay).