I work with Eric and I just want to say one of the hot fixes we currently have installed was supplied by the HP Forums that fixed out drag and drop attachment feature that did not work with SP25 and Dynamic forms. HP said they would fix the drag and drop feature feature in SP27. Would HP merge a Hotfixs even though one of them was not a HP generated Hotfix?
I can't say 100%. provide the "unofficial" hotfix to them and see what they say. if they have it fixed in SP 27 but you cannot upgrade for a specific reason and you (the customer) has a support contract they may look into it for you. - Can't say its 100% guaranteed but state your case if you need to.
You can do that by using jar command (part of JDK) or just simple zip. The .jar files are in fact .zip files. So just uncompress one of them (with directories) and add what you get to the other one (be sure to extract and then add back with pathnames). That should do the trick.