The default STL has a fair number of issues that make it difficult to use with games, especially when it comes to memory alignment.
A customized variant such as the EA STL is specially designed for games and can get you much better memory performance and console usability. I haven't seen an open source gaming STL variant, but it would not be impossible to replace piecemeal the important bits.
Note: the EASTLIt became open source in 2016, under a BSD-3 clause, with a repository on GitHub.