It would be great to have a button to force a one lot trade irrespective of Buying Power %. (i.e. ignore margin) Once BP gets high enough to fire off a two lot it would automatically compound as per normal. Great for small accounts where BP may dip below percentage required for a one lot, even though you have plenty of BP to fire off a one lot trade.
Example: you have a $30K account and set automation to use 1% allocation. If a trade bumps above $300 the trade won't fire. This leaves you having to decide on one lot in perpetuity or if you have enough of a buffer to switch to percentage.
Proposed button: At least one lot, follow percentage after that.