I prefer to currently not add any configuration option to allow writing ID3v2 frames TXXX:BPM instead of TBPM.
I believe that many valid explanations were already given and I'd prefer everyone who is missing support for this standard frame to instead ask the developers or company behind the respective tool to add support for TBPM.
If this is not an option, there is plenty compatible software out there (also recommended in this topic) which might make life a little easier.