Downloads to external SD card

OK, first off I did a search and you get too much stuff to sort through, a lot of it irrelevant, so I'll ask here. Thwe only thing I can see to do is to download apps to the external SD card. Wha about downloads. My download file is on the internal storage. Sowhen you need to flash a zip file you have to go to internal stoage and copy the download to external so recovery can find it. My question is, is there a way to direct downloads to the external SD card? Another possibility I suppose is to copy/cut the download folder from internal and paste it to external. Will that work?

This is a rooted Droid Bionic with Kin3tics ROM and PUR add on if that makes any difference. Also, what sort of stuff is best left to internal storage vs external storage? Thanks