As a guild officer and someone who has 190 out of 200 maximum people on my friends' list, it's fairly difficult to keep track of who everyone is and when they were last online. Without being able to see when players were last online, it makes clearing out inactive players damn near impossible on Guild and Friends lists. This leads to bloated lists of people who you're unsure still plays or how often.

A simple "Last online: XX/YY/ZZZZ" displayed whenever you hover over a players name would be absolutely wonderful. You'd be able to spot immediately who still plays often.

But let's take it a step further: how about also adding the option to write notes about the player in question? With threads such as these that have a lot of popularity and most likely the reason why I'm running out of friend space ---
http://forums.spiralknights.com/en/node/9130
http://forums.spiralknights.com/en/node/4629
http://forums.spiralknights.com/en/node/7285

It would be massively helpful if you could write in your Player Notes that they're from a thread, their general gear level, how well they played, and things like that.

In the end, both of these suggestions would make managing your friends and guild much easier and efficient. If you guys support this or have ways to make these suggestions better, post away!