not sure of usecase for OP, but I use the built in rtf editor for notes quite a lot (Edit Entry>Advanced>File Attachments>Attach>Create Empty Attachment(Or Open existing ones) and it'll be super handy if i can have more than one of them open (in tabs like sublimetext for bonus points :) ) and still be able to use keepass for 'regular' operation. at the moment you're locked into that one edit window