Jerry,
You need an additional certificate for each callsign, so if you sign your call followed by a / slash and some other designator, you need to request a certificate for that.
KJ4EU,
KJ4EU/4,
KJ4EU/1, KJ4EU/P,
KJ4EU/R, etc., each is a separate callsign and a separate certificate. But it's not that difficult, once you have your main station certificate established. You don't have to go through the whole verification process again.
As for whether that's advisable to do, I think it's probably a matter of preference. Others can weigh in with the pros and cons, and I'd kind of like to see that discussion myself.
LoTW allows you to define a location with up to four grids, so if you are on line or a corner, that can be one location.
ACLog, however, doesn't like multiple grids. It's not a big deal for you, so long as you know where you are and that you upload to LoTW using the correct certificate and location. LoTW will define your grids by the location you choose on upload, not ACLog. But if you work someone else who is on a grid line, you will need to enter two separate QSOs with the same station, at least a minute apart, one in each grid. That issue is not unique to ACLog. It's common with lots of other logging programs, as well.
--
Mark D. Johns, KØJM
AMSAT Ambassador & News Service Editor
Brooklyn Park, MN USA EN35hd
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"Heaven goes by favor; if it went by merit,
you would stay out and your dog would go in."
---Mark Twain