We are a small institution with about 750 students. Our library set things up so that only the DDA titles we turned on ourselves, not the entire catalog of DDA titles, show up in Summon. We felt that doing it this way would allow us to choose the most appropriate titles for our curriculum and to stretch our deposit. We currently have about 575 titles turned on and we add to it all the time. Given that we can get a list of owned titles by going to Ebook Central, the public availability statement (currently "full text online") would have the most effect on user behavior. I'm not sure exactly what the replacement statement would be but if it was something like "click here if you would like for this title to be purchased," some students might be confused or hesitate to use the title, especially if they aren't sure that it will be useful to them, while some faculty might use it as a collection development tool (which would burn through a deposit pretty quickly, especially if all 500,000 titles could be accessed).
Without knowing your particular circumstances, I do not know why you have proposed to change the availability statement, or at least to make it configurable, but if your motivation is financial you can work with a ProQuest rep to change your DDA configuration and narrow titles based on subject area, price, publisher, etc. You can also set parameters for access-to-own (ATO) and short term loan (STL) titles.
With that said, I see no reason why libraries shouldn't have the the power to configure their own availability statements if they should desire to do so.
We are a small institution with about 750 students. Our library set things up so that only the DDA titles we turned on ourselves, not the entire catalog of DDA titles, show up in Summon. We felt that doing it this way would allow us to choose the most appropriate titles for our curriculum and to stretch our deposit. We currently have about 575 titles turned on and we add to it all the time. Given that we can get a list of owned titles by going to Ebook Central, the public availability statement (currently "full text online") would have the most effect on user behavior. I'm not sure exactly what the replacement statement would be but if it was something like "click here if you would like for this title to be purchased," some students might be confused or hesitate to use the title, especially if they aren't sure that it will be useful to them, while some faculty might use it as a collection development tool (which would burn through a deposit pretty quickly, especially if all 500,000 titles could be accessed).
Without knowing your particular circumstances, I do not know why you have proposed to change the availability statement, or at least to make it configurable, but if your motivation is financial you can work with a ProQuest rep to change your DDA configuration and narrow titles based on subject area, price, publisher, etc. You can also set parameters for access-to-own (ATO) and short term loan (STL) titles.
With that said, I see no reason why libraries shouldn't have the the power to configure their own availability statements if they should desire to do so.