I'm learning that longer subs are far more important than number of subs for fainter objects.
Yes and no. Long sub can saturate and bolt some stars or areas. You must try many configurations to find the best time and ISO.
And yes, SMC and LMC have many interesting objects. I am working on them. You can take a look at:
SMC -
http://jsmastronomy.30143.n7.nabble....aes-f1092.html
LMC -
http://jsmastronomy.30143.n7.nabble....aes-f1042.html