The compressor only runs about 25% maybe 30% of the time in a Dakota. It may just end up running a higher duty cycle. On a daily driver this may mean wearing our more quickly, so instead of lasting over 100k miles it may only last 50k. How long will it take you to rack up 50k miles?
Believe it or not, the compressor runs all the time on these systems.
http://imperialclub.com/Repair/Lit/Master/295/page07.htmI do have the Unwired Tools A/C servo replacement for Mercedes cars. My car has the AutoTemp II system that Chrysler sold to Mercedes in 1975. I'm not sure if it'll stop the full time compressor or not.