Description of problem: httx activation hotkey works with CTRL-SPACE but not SHIFT-SPACE. This is bad because it is inconsistent with native IIIMF input. Also Japanese and Korean legacy users know and prefer SHIFT-SPACE while disliking CTRL-SPACE. Version-Release number of selected component (if applicable): im-sdk-12.1-6
Well, I think what you are saying is 1) shift+space which is used on legacy XIM doesn't work on IIIMF. 2) and should disable ctrl+space on some lanauges. Well, for 1) it should be fixed in the latest. so we can close it. for 2) it's the duplicated bug of Bug#118023. for 1) please confirm if it was fixed for you.
Ok, well XIM server iiimx doesn't support the hotkey protocol actually. so it's why iiimgcf works but iiimxcf doesn't. it needs to be implemented. FYI
I just considered to separate a bug for 1) and 2). and Bug#157197 was filed to support the hotkey protocol.
Fixed in 12.2-3. now shift+space works with even XIM.