I think it's great if we can get all IMP developers including in Europe and Asia on board, at least for the first meeting. IMP development could benefit a lot from collaboration among the various IMP labs, and this could also support future collaboration among IMP labs.
The timezone is an issue - my recollection is that we have developers in Spain (+8 hours), France (+9 hours), Israel (+10 hours), possibly in Germany (+9 hours - Jan Kosinski at EMBL, Heidelberg may be interested). If I didn't forget anyone (Ben?) - a morning meeting here (say 10 or 11 am) could allow them to join in the European/ME evening.