Given the low- (or no-) cost nature of code editing tools, modes, and pluggable modules, have some of your developers try one or more of these solutions and give you an assessment. For some team members, checking code in and out of a repository and into an IDE may be best, but other programmers may find that repository interaction with pluggable code editing tools is a much better fit for their working style.
Choosing an IDE or modular code editing approach is not an all-or-nothing proposition. Wise enterprises are those that leverage the best of both these worlds to create development methodologies that deliver results. Code editors support multiple languages, platforms, and mixed developer skill levels, adhere to corporate standards, and often lead to the productivity gains. If giving developers a little control over the tools they choose can spark all those benefits, a flexible tool strategy becomes an easy choice.