The grid-, market- and system-supportive use of decentralised electricity storage systems and electric vehicles with bidirectional charging requires suitable regulatory conditions. The MiSpeL Pauschaloption developed by the German Federal Network Agency is intended to enable the mixed charging of storage systems with PV electricity and electricity from the grid, followed by feed-in to the public grid. This paper uses an optimisation-based simulation model to analyse the effects of the 2025 Consultation Draft and the Revised Working Version 2026 on different prosumer configurations with stationary battery storage systems and/or bidirectional charging infrastructure with an associated electric vehicle. The results show that, in cases with high PV surplus feed-in, the original consultation draft can create financial benefits solely by changing the accounting concept, without storing electricity from the grid and feeding it back into the grid. This creates a false incentive, as financial relief can occur without the market- and grid-supportive storage operation that the regulation is intended to promote. The indifference range introduced in the Revised Working Version 2026 of the Pauschaloption significantly reduces this effect. At the same time, however, it increases the offsetting threshold and therefore the barrier to the economically viable intermediate storage of electricity from the grid. As a result, actual storage of grid electricity followed by feed-in back to the grid is economically used in only a few of the analysed configurations. For electric vehicles with bidirectional charging, the largest additional potential mainly results from the time-shifted feed-in of PV electricity and reaches up to around EUR 600 per year in the analysed cases. Overall, the results show that the fixed remuneration limit of 500 kWh/kWp and the indifference range can only partly reflect different consumption levels, self-consumption patterns and system configurations.