For those of you who have access to Pachyderm's MySQL database, you can remove
the upper limit on how many the Slider template can hold by modifying the
following code in the templates component definition.

limit for="pachyderm.slider.media_item" strict="YES
min-length
1
max-length
12

If you remove the max-length key and the following integer tag, it will make the list have no upper bounds.

limit for="pachyderm.slider.media_item" strict="YES"
min-length
1
Best,
Scott