Question about extending boxes plugin

hi,

I want to extend the boxes plugin to provide a way to attach predefined views as a block - similar to managing news boxes is doing

to get input from the user im using the options_form() function - is there a simple way to use ahah in that form?
i want that the admin will be able to choose a term id as the views argument for the view i'm embedding - but for that the admin should choose first the vocabulary he wants and then after an ajax callback get the right list of terms to choose from.

is there an easy way to implement it?

thanks