or you could pal up with or buy Textra to save the time of writing your own
a workaround is to manually attach a small pic to force mightytext web to use mms rather than sms format. same method will also allow sending more than 500 character messages without mightytext web giving you an error. it does totally suck to have to do this. it'd be far better for there to be a user-configurable value for the character threshold for mightytext web to convert from sms to mms. the worst part of it is that messages over 160 i send indicate in mightytext web that they were sent but they neither show up as sent in my messaging app nor arrive at the recipient end, so you think you successfully sent a message and the recipient never sees it.
i wholeheartedly agree that a search function would be great