Sometimes a wizard wants to rejoin a group (i.e. in the Helephant Tower), but can't because another wizard (usually without text chat) keeps hopping on the sigil. A worse scenario is if another wizard hops on at the last second or can't be seen as on the sigil because several wizards are standing in the area.
To prevent that, the menu could include an option to go in alone. It would be accomplished with the use of the "Z" key. The menu would read:
Stormdrain Tower Press X to enter Press Z to go in alone