Expanding space for dialogue

If it opens with FF3usME you should be able to check on the very first main window when the program opens under 'manage expanded ROM', and it will show which bank the patch has been applied to at least, although that's not what you asked is it... I may not be understanding the intent of the question, and am wondering why you're not able to edit the dialog currently with FF3usME - having the ROM expanded shouldn't normally mess with its dialog editor function. Is there some kind of error you are receiving? Something like how the dialog pointers were hex edited and it cannot work with it anymore? If so we can be sure Angelo's patch wouldn't have caused this, so it must be something in Dr. Meat's hack he did/caused, possibly even saving twice in a row without exiting the program which can cause this error depending on certain changes or circumstances that I've forgotten, but it's a known bug with the program that causes a massive data shift. Fixing the dialogue editor back to working might be out of the realm of possibility without reverting/repairing the dialog and pointers to vanilla, which would be easy enough sure, but defeat the purpose of the hack's dialog changes of course lol. But first I should let you answer if this is indeed what's happening!

Anyways to locate where the dialogue pointer(s) is, one way would be to utilize a patch log report using Lunar IPS: using two original clean ROMs and then expanding one of them and applying the dialogue patch, and finally creating a patch from that and the clean ROM and the report will show the changed pointer(s) address, among many other things, but the actual pointers used for the dialog patch should be somewhat easy to pick it out once you know what bank the dialog patch was applied to, you see. There may be a shit-load of them though, I can't recall. They would all be in the same range at least I'd imagine.

EDIT:
I went and caused the 'save twice error' to my ROM just to show what all it effects shown by a patch report:

Lunar IPS (LIPS) Version 1.01
Apply IPS Patch Log

Offset Size RLE IPS_File_Range IPS_File_Size
------ ---- ID 00000000-00000004 5
CCF654 9A9 No 00000005-000009B2 9AE
F10000 68 No 000009B3-00000A1F 6D
F10068 B0 Yes 00000A20-00000A27 8
F10118 FFFF No 00000A28-00010A2B 10004
F20117 E28C No 00010A2C-0001ECBC E291
F2E3A3 18 Yes 0001ECBD-0001ECC4 8
F2E3BB FFFF No 0001ECC5-0002ECC8 10004
F3E3BA 2EFE No 0002ECC9-00031BCB 2F03
F412B8 BD Yes 00031BCC-00031BD3 8
F41375 EC7C No 00031BD4-00040854 EC81
------ ---- EOF 00040855-00040857 3

Total Patches: A (10)

As you can see, a massive data shift thus resulting in that error & rendering the Dialog Editor useless. Reverting this data with a backup ROM would fix it in this case, but for you if this is in fact the problem, that couldn't be done. Unless you may have caused it yourself and it's not a problem with the Relocalization mod by default, I didn't check into that and just assumed it is.