It should be the default way and I think its a great idea to include Mass Reference Load in X,Y and Z global  direction as a default as it works for ELF, RSA and TH, Static and Dynamic Analysis.
I would also Suggest Let User define what they would like to call a Load Combination, obviously including a Repeat loads, instead of traditional Non P-Delta Analysis as LC.
I think this will avoid confusion and errors on user's part as tweaking error prone way to modify .STD input file.