There is no keyboard shortcut for this unfortunately. It's not possible to paste to multiple channels at once either, but I'll add this to the todo list. Thanks.
No my intention to hijack the op's thread but seeing we are talking about copy/paste............is there a way to copy a plug's settings and paste to another plug of the same type on a different channel?
For insert effects this is possible by holding Alt and then dragging the insert to another channel (or the same channel). This will copy the insert instead of moving it.
Sorry, I was mistaking about not being able to copy/paste to multiple channels. In fact the copy/paste function automatically pastes to all selected channels.