Just like when TA incorporated the symbols for
buttons, or
, I bet you will be quite surprised at the amount something like this would be used if it were available, I know I would have used something like that on a couple of my solutions had it been there. Yeah a few people make external spreadsheets etc, but they are quite the pain when you have an ipad like me. It is just another tool that makes things easier for those that want to utilize it.
I am thinking something like what Twinkling said above, which isn't that much different than the buttons or spoiler tags imo, except it would be bonus if it remembered what you checked if you looked at another solution,(maybe a cookie or something, like how it remembers that I logged in already, I am sure Rich could figure out what the best approach is if that is possible)
Here is an example: NHL 15 achievement to collection one player card from each team:
[check] Anaheim
[check] Arizona
..
[check] Washington
CHL
[check] Kamloops
[check] Kelowna
etc
For the NHL 15 achievement for collect a player from every team in all leagues, I was literally having to write down each team I collected from(and there is a pile of them) to avoid having to go back to my collection each time from the trade marketplace, and wound up buying multiples from some teams. Can you imagine if the solution allowed me to click to say I got a player from each of teams, it would have saved tons of time, and some nhl coins.