def
Yes there is the uptick rule and you need to flag when you get short sales, but it is only apply to institutional investors. I mean individual investors or traders, individual traders can place an order for short sales whenever you like and even if the price you place is lower than the last traded price just like the e-minis trading so far. But I do not know in the future because the Japanese government always change its rule suddenly and most of them do not cause good result for the market.
man
Yes I know many brokers because I used to trade Japanese stocks for five years. For example the E-trade Japan, if you get a margin account there the commission is 550 Yen (about $4.65 in the current rate) per side no matter how many shares you trade. But as I have mentioned you must have an address in Japan in order to open an account there. In fact stock market including all other financial market in Japan do not open its market for foreigners well, it is the governments policy as well. I can understand you feel strange about the one round trip per day rule but it also is a fact there and it is one of the reason for my shifting to the US market. Aa the result of the stupid rule investors and traders now be reducing in Japanese market.