Hey Jon,
regarding the tags. The tags are optional, not required, so you are more than welcoem to leave the field blank if you wish. it is not possible to script the adding of the commas beucase the script woudl not know what your intentions were. since you can use multi word tags, its not as easy as adding a comma. for example you could have "food" or "fish food" or "fish food flakes" all as a single tag. but there is a max of three words per tag.
for more info on the tagging system see this post
New Tagging system
PS.
you are more than welcome to convert the vidcasts to any format you want..
