Remote control weaknesses

I bought the radio trigger mainly when shooting at night.
The adapter works as far as I've tested quite decent, quality, packaging and accessories make a resonable impression. However it has two disadvantages:
1. Man can only use the Bulbfunktion by hällt the whole exposure time on, press the shutter button on the remote control. For my purpose completely unsuitable, since I mostly want to use for the Lightpainting Äuslöser. But I prefer from 1 star.
2. None of the two parts can be attached properly on the camera's hot shoe. It is simply plugged it and good. Hällt itself quite well, but if you want to use a flash, you can install the, but the risk is simply drops when moving / transporting the camera flash, including receiver relatively high, therefore additional 2 star minus.