Your answers:
Is my understanding right in thinking still I need to use concatenate etc workarounds for handling these type of fields ?
Correct unless you are on BW 7.4 which allows 240 as length.
Another thing I have blank spaces in those and while I try to get those comments from PSA to cube it gives Hexadecimal conversion issue. When I removed spaces in PSA, it worked fine. But I want to know in RSKS how to give spaces whiel giving all the allowed special characters...
Same as above check below links:
how to add more characters in RSKC
Cheers!
Suyash