I'm split on this. On one hand it would be nice to be able to communicate to the tower that you're aborting due to incursion/weight/other issue to avoid a ghosting, but I'm afraid it might encourage unnecessary rejected takeoffs. Currently, if a pilot needs to abort it will mostly likely be in a situation where ATC can see what's happening, if there's an airplane on the runway or something. Even if ATC doesn't see it, turning off the runway and saying "I'm sorry" and asking for a frequency change to contact ground should work. Also, if you're in a situation where you have to reject a take off, time shouldn't be spent notifying ATC, but instead stopping the plane. I suppose it would be helpful to notify ATC after you stop, but I'm not sure it's necessary.
Edit: I got to this thread off another post about RTO procedures, and didn't realize this one was three months old. Didn't mean to bump.