Oh I'm positive Disney loves when DAS users are spending more time (and money) in shops or on food. I'm sure Disney is less thrilled about DAS users holding a return time and adding to the 10-15 min queues, taking up prime parade viewing locations, or taking up prime show seats... however the reality of stopping DAS users from experiencing these things is just not feasible for the negligible negatives on the rest of the park guests.
The only grey area I can think of (where feasibility might meet cost) would be to not allow DAS users to REDEEM a LL while holding a DAS return time. From a technology/cost stand point, it would be pretty easy to implement. However, I highly doubt the risk of loosing DAS LLSP/LLMP users would make more money than adding those slots back into the LLMP/LLSP pool for non-DAS users. (aka I think they would sell less LLs)