While it seems like you should be able to, in our experience the answer was no.
This past December (2014) we took our expired park tickets to Guest Services at DTD to ask what WPF&M options were still available to us. I thought each ticket had 5 entitlements/options left but I couldn't recall exactly sure what they could be used on. The gentleman told us each ticket did have 5 passes (I had thought they were called entitlements/options) left on them and the waterparks, DisneyQuest, ESPN, mini golf locations (no time restrictions were mentioned) and golf at Oak Trail (no restrictions were mentioned) were the options available to us.
We caught a bus for Winter Summerland where we were told mini golf was not available to us. I explained that we had just come from GS at DTD and the gentleman there had said it was. He got a 2nd Cast Member who repeated to me that mini golf was not available. I said okay, that I would go back to GS at DTD and see what it was that I misunderstood. He got a 3rd Cast Member and he said he would let us play 1 round for free because of all the problems and gave us back our tickets.
The next day I went back to Guest Services at DTD and explained what had happened the day before. The Cast Member checked our tickets and said that the gentleman from yesterday had misinformed me. When I bought my tickets mini golf was not an option and because of that, there was no way to add mini golf, upgrade them or replace mini golf with an option we couldn't/ wouldn't use. She said the tickets currently being sold do have that option but that doesn't change the old tickets in any way. She ended up giving us a voucher of sorts for 2 rounds of mini golf for each of us as compensation for the confusion, embarrassment at Winter Summerland and the trips to Guest Services
I should mention that I did ask at our hotel first but was told that because the tickets were so old, from 2002, any questions I had regarding the tickets had to be asked at GS in DTD or at GS in of the parks.
YMMV but as I said, our recent experience was no.