Thanks for help.
I am about to buy a DONE5 and am only using 19 segments

I have two questions

1. What is the best use of the extra segment
2. Is it worthwhile for me to pay for the JNB-CPT-JNB (not use OWE for it) in order to make better use of my 20 segments I am allowed. (It seems like a relatively short flight to spend OWE on. Paying out of pocket would free up 2 more OWE segments.)

Following are segments I was going to pay for myself (not use OWE for). I am over my 4 segments per continent (except in Africa).

HKG-SGN
SGN-HKG
DEL-TAS
TAS-DEL
DEL-BOM
BOM-DEL

I have to buy (LAN PASS?) or overland EZE-USH, cuz I used my S. America segments Diitto with LIM-CUZ, CUZ (OR LIM)-IQT, and EZE-Igaucu Falls

Thanks.