Ex: you have rank "member" with 10 slots, the order in which people show up is based on the date they joined your guild

instead, I propose a customized ordering within a particular rank.

Very similar to how we can change order of the ranks themselves, I would like to see changing order of users within a rank.

I think this is pretty self explanatory but if there is any confusion I will post images.

You have already this same suggestion here: http://forums.d2jsp.org/topic.php?t=69269758&f=258