[Koha] Extending loan times for a subset of users

Hello, I have read through the db schema and documentation and suspect what I'd like to do isn't possible, but thought I would cover all bases by asking here: Suppose we have a 1st year BA student on course X, they belong to category BAX1, along with all other 1st year BA's on that course. Now suppose that same student has registered as dyslexic, which means we want to give them a longer loan period for all items as the default. Is there a way of doing that *without* moving them into a different category? Thanks, all the best, Chris