Add Suffix feature request

I regularly use InDesign to build layouts destined to be JPG or PNG, so this new feature is very much appreciated, BUT when using the + Page Size suffix, the suffix includes spaces [eg."_1260 x 350"] rather than the more web-friendly underscore or even better no spaces at all please. [eg."_1260x350"]

I've been using the [absolutely wonderful] Batch Rename feature of Bridge to fix this after the fact, but wondering if it would be possible to be able to choose/customize the suffix content more.