The URLs seem fine, this is a system used by multiple boards. It's useful for linking from outside the Guild, too. Another option might be to grab the title text of [code][url]http://roleplayerguild.com/topics/99999-this-is-a-topic[/url][/code] link and replace the raw URL with the title text. Local only, of course, to conserve resources and GET requests. 

[quote=@Mahz]
Cool idea. Though it would make more sense once GMs actually have GM-specific powers in their Roleplays and can share that power with Co-GMs.

Though I haven't really mapped out exactly what "GM-specific powers" actually means yet. Some ideas while we're here:

- Close/Open roleplay to new participants
- Approve applicant (applicant is now eligible to make IC posts)
- Kill Character
- Edit Character Status

Something like that. And by "Character", I mean that I'd like to implement first-class support for a character system. Some way to create/manage characters (or create them ad-hoc per roleplay), switch between them during a roleplay, annotate them during the roleplay (like the GM can edit a character's status to indicate that the character has a broken leg), and kill them off (just from the roleplay).

Going down the rabbit hole here, but it's an idea. The main limiting factor for these kinds of big roleplaying ideas is that it's hard for me to flesh them out by myself since I don't actually roleplay anymore.
[/quote]

Additional thoughts for Co-GMs:
[list]
[*]Ability to remove/ban a player from posting in the thread (separate from character killing, this would be a way to remove troublemakers). 
[*]Edit the OP (I think you already mentioned that in a later post)
[*]Hide or remove the posts of non-playing players (for players that have left/been removed from the RP, the ability to remove (or just hide if you want to reserve deletion power to mods) posts that disturb the RP's flow would be useful. 
[/list]