Option to change done.txt file-name?

[antler5]

Hi! I love this plugin, and use it to keep track of my todo-list on my pc and laptop alongside the FOSS Markdown & todo.txt editor Markor on my Android. I sync a folder between all my devices, and this setup works great for me, but there's a minor issue. todo.txt-vim archives completed to-do's to done.txt, but Markor archives completed todo items to todo.done.txt! I thought it'd be a quick fix and checked :h, but alas; and neither does Markor support changing the archive file-name at this time.