@handful, cLin
Is there anything contrary to a symlink from the canola youtube-temp-dir to, say, /media/mmc2/youtube-temp? I tested it on my device and it worked flawlessly

for those of you who want to try it (on risk and so on, and *remember* that you did this change, so you can revert it when canola has a folder chooser for this)

open an x-term shell: you are in your home direcory now.
cd .canola/youtube
create a new youtube-temp-directory, e.g. on /media/mmc2:
mkdir /media/mmc2/youtube-temp
now the "crucial part": this one deletes your normal canola temp-dir
rm -r videos
and now we create a symbolic link called "videos" which points to our newly created temp dir:
ln -s /media/mmc2/youtube-temp videos
(in caps this would be LN not 1N)

after this you should be able to do a
cd videos
echo 1 > 1

and if you open your filemanager and go to the folder in which the youtube temp-files should be stored (internal mem. card/youtube-temp)
you should see a very small file called "1" now.
Delete it, as we don't need it anymore and test your youtube videos...


To revert this change:
=================

open an x-term shell: you are in your home direcory now.
cd .canola/youtube
rm videos
mkdir videos

this will only delete the *link*, so your "new" youtube-temp directory is still there and can be deleted.