What's the max weight a Btwin riverside 50 can hold?
The manual offered with the BTWIN Riverside 50 (click on the bike manual tab) indicates that 100kg is the max weight for your bike. 94 + 5 = 99 so you are under the limit. Max weight limits take into account rough usage. Pedaling while standing and daily commuting is well below rough usage. The pedals on this bike have a large steel rod as the main support with a sheer strength much larger than 200 kg.

No modifications are needed.