I would love to have some sort of sortable table with all the brokernames on the left and various details about them on top.

What I personally would like know about them would be.. MT4 support Y/N API support Y/N minimum trade size in dollars, minimum account needed to get started. typical pip spread for eur/usd

It would be quite an expansion of the Brokers section, but I think it would be very handy when trying to find a second broker. (or a first for that matter).

Another way to do it would be to create some sort of search mechanism as we have in the systems section.

Some additional ideas:
Add also if broker uses dealing desk or is using ECN/STP
Make search box so that one e.g. can exclude those with dealing desk from the list
Make it possible to list all on one page
List if comply to NFA rules
List GMT offset

OK I realize that brokers have very different properties for different accounts and also that keeping the list up to date would require quite some maintenance or user interaction. Why not letting the brokers update their own info?

For sure it needs to be attractive for them to keep their data up to date. Perhaps needs an icon to indicate that this data is maintained by the broker, and a 'last updated' date would help. Brokers want customers, right?
Regular update requests sent to them?

Add non-changing (or seldom changing) fields first, such as country of operations for example, just to try the concept of having them to maintain it. Add more later.

Funding options are also an interesting.

OK this is perhaps not the most pressing issue but more of a future development idea.