I understand where you are coming from but I don't see any actual problem that is being caused by REDs killing BLUs for DR, and skimming over the thread I haven't noticed much examples besides that "it is just wrong." If anything, it would cause more issues to make change something so traditional such as this. For some points mentioned though:
- Wastes time - IMO REDs being allowed to freely kill BLUs makes DR go by quicker, since then the RED can just kill the BLUs and end the round, as opposed to not being able to and either need to do an activity (which I would bet a lot would do and would most of the time take longer) or suicide/get killed by BLUs (which probably will be frequent too but not as much). Although, I would be open to supporting a shortening of the time from 2 minutes to 1 and a half, but that doesn't seem to be the point of this thread.
- Custom LR takes care of this - Custom LRs (and LRs in general) only really apply to the next round, not the current round, so I don't really follow